Chapter 3 Themes Of Anthropology: Evolution Quiz

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  • 1/47 Questions

    The idea of biological evolution goes back to?

    • The ancient Greeks
    • A century or so before Charles Darwin
    • Charles Darwin
    • Around the beginning of the 20th Century
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Anthropology Quizzes & Trivia
About This Quiz

YThis is a practice test I am doing for myself, I mean no copyright infringement and this is just for personal testing of my knowledge.

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  • 2. 

    Archbishop James Ussher is credited with calculating the age of the earth at about?

    • 4.5 Billion years

    • 12 to 18 Billion years

    • 65 Million years

    • 6000 years

    Correct Answer
    A. 6000 years
    Explanation
    Archbishop James Ussher is credited with calculating the age of the earth at 6000 years. This calculation is based on his interpretation of the Bible, specifically the genealogical records in the Old Testament. Ussher used these records to trace the lineage from Adam and Eve to various biblical events, such as the birth of Jesus Christ. He then added up the years between these events to arrive at an estimate for the age of the earth. However, it is important to note that Ussher's calculation is not supported by scientific evidence and is widely considered to be inaccurate.

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  • 3. 

    Jean de Lamarck's idea about biological evolution included both correct and incorrect parts.  Which of his ideas has proved to be correct?

    • That life evolves toward increasing complexity

    • That living forms become more perfect with time

    • That individuals inhered new adaptations acquired by their parents

    • That evolution is related to changes in the environment

    Correct Answer
    A. That evolution is related to changes in the environment
    Explanation
    Jean de Lamarck's idea that evolution is related to changes in the environment has been proven to be correct. This concept is supported by the theory of natural selection, which states that organisms that are better adapted to their environment are more likely to survive and reproduce. Over time, this leads to changes in the traits and characteristics of a population, resulting in evolution.

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  • 4. 

    Which is NOT a part of Lamarck's inheritance of acquired characteristics?

    • Recognition by an organism of environmental change

    • Automatic production of new adaptive traits

    • Possibility of extinction when adaptation doesn't work

    • Passing on of acquired traits to offspring

    Correct Answer
    A. Possibility of extinction when adaptation doesn't work
    Explanation
    Lamarck's theory of inheritance of acquired characteristics does not include the possibility of extinction when adaptation doesn't work. According to Lamarck, an organism can recognize environmental changes and respond to them by automatically producing new adaptive traits. These acquired traits are then passed on to offspring. However, Lamarck's theory does not address the possibility of extinction as a result of failed adaptation.

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  • 5. 

    The contribution of Charles Darwin to the theory of evolution was that he?

    • Proved evolution had occurred

    • Disproved the Bible

    • Provided a mechanism to explain how evolution works

    • Was the first to apply science to the study of evolution

    Correct Answer
    A. Provided a mechanism to explain how evolution works
    Explanation
    Charles Darwin's contribution to the theory of evolution was providing a mechanism to explain how evolution works. He proposed the concept of natural selection, which states that individuals with favorable traits are more likely to survive and reproduce, leading to the gradual change of species over time. Darwin's theory provided a scientific explanation for the diversity of life on Earth, and it revolutionized our understanding of the natural world. His work laid the foundation for modern evolutionary biology.

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  • 6. 

    Darwin's idea about the major process of evolution is called?

    • Descent with modification

    • Natural selection

    • Inheritance of acquired characteristics

    • Adaptation

    Correct Answer
    A. Natural selection
    Explanation
    Darwin's idea about the major process of evolution is called natural selection. This concept suggests that individuals with advantageous traits are more likely to survive and reproduce, passing on those traits to future generations. Over time, this leads to the accumulation of beneficial traits in a population, ultimately resulting in the adaptation and evolution of species.

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  • 7. 

    Darwin delayed for some time before publishing his idea.  Which was NOT a reason for his delay?

    • His idea acknowledged extinction

    • His idea did not include progressive evolution toward greater complexity

    • His version did not claim that evolution was directed toward humans

    • Nobody believed in evolution in the first place

    Correct Answer
    A. Nobody believed in evolution in the first place
    Explanation
    The given answer suggests that the reason for Darwin's delay in publishing his idea was not because nobody believed in evolution in the first place. This implies that there were other reasons for his delay, such as his idea acknowledging extinction, his idea not including progressive evolution toward greater complexity, and his version not claiming that evolution was directed toward humans.

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  • 8. 

    Alfred Russel Wallace is known for?

    • Proposing explanations for evolution that differed from Darwin's

    • Hitting upon the idea of natural selection at about the same time as Darwin

    • Deriving the basic laws of genetics

    • His advocacy of divine creation

    Correct Answer
    A. Hitting upon the idea of natural selection at about the same time as Darwin
    Explanation
    Alfred Russel Wallace is known for hitting upon the idea of natural selection at about the same time as Darwin. This means that he independently came up with the concept of natural selection, which is a key principle in the theory of evolution. Wallace's work on natural selection provided strong evidence for the validity of Darwin's theory and greatly contributed to the development of the theory of evolution.

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  • 9. 

    The basic laws of inheritance were articulated by?

    • Gregor Mendel

    • Charles Darwin

    • Alfred Russel Wallace

    • Archbishop James Ussher

    Correct Answer
    A. Gregor Mendel
    Explanation
    Gregor Mendel is the correct answer because he is widely recognized as the father of modern genetics. Mendel conducted experiments with pea plants in the 19th century and discovered the fundamental principles of inheritance, including the concepts of dominant and recessive traits, as well as the laws of segregation and independent assortment. His work laid the foundation for our understanding of how traits are passed from parents to offspring and revolutionized the field of genetics.

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  • 10. 

    The core of Mendel's ideas about inheritance are that?

    • Genes undergo mutations

    • Inheritance involves the passing on of "particles"

    • Inheritance involves the blending of parental substances

    • Genetics explains how evolution works

    Correct Answer
    A. Inheritance involves the passing on of "particles"
    Explanation
    Mendel's ideas about inheritance revolve around the concept that traits are passed on from parents to offspring through the transmission of "particles," which we now know as genes. This concept is known as the particulate theory of inheritance. Mendel's experiments with pea plants showed that traits are inherited in a discrete manner, with each parent contributing one allele for each trait to their offspring. This idea laid the foundation for modern genetics and our understanding of how traits are inherited.

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  • 11. 

    An allele is?

    • A variant of a gene

    • The same as a gene

    • A mutated form of a normal gene

    • A recessive version of a gene

    Correct Answer
    A. A variant of a gene
    Explanation
    An allele is a variant of a gene. Genes are segments of DNA that contain instructions for building proteins, and alleles are different versions of a gene that can produce different traits or characteristics. Alleles can be inherited from parents and can be dominant or recessive, meaning that they can have different levels of influence on the expression of a trait. Therefore, the correct answer is "A variant of a gene."

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  • 12. 

    The combination of genes in an individual is called the?

    • Phenotype

    • Genotype

    • Allele

    • Dominant

    Correct Answer
    A. Genotype
    Explanation
    The combination of genes in an individual is referred to as the genotype. The genotype determines the genetic makeup of an individual, including the specific alleles they possess for each gene. It is the combination of these alleles that ultimately determines the expression of traits and the phenotype of the individual.

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  • 13. 

    The expression of a genetic combination is called the?

    • Phenotype

    • Genotype

    • Allele

    • Dominant

    Correct Answer
    A. Phenotype
    Explanation
    The term "phenotype" refers to the observable characteristics or traits of an organism, which are determined by the interaction between its genetic makeup (genotype) and the environment. It encompasses physical traits such as eye color, height, and hair type, as well as physiological and behavioral traits. The phenotype is the result of the expression of specific alleles (alternative forms of a gene) that an organism inherits from its parents. Therefore, the correct answer is "Phenotype."

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  • 14. 

    Alleles that are both expressed in the phenotype are said to be?

    • Dominant

    • Homozygous

    • Co-dominant

    • Recessive

    Correct Answer
    A. Co-dominant
    Explanation
    Co-dominant alleles are both expressed in the phenotype. This means that when an individual has two different alleles for a particular gene, both alleles are fully expressed and contribute to the phenotype. In other words, neither allele is dominant over the other, and they both have equal influence on the phenotype. This can result in a blending or combination of traits from both alleles, rather than one allele masking the effects of the other.

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  • 15. 

    In Mendelian genetics, a dominant allele is?

    • Better fit

    • More common

    • The one that codes for the normal expression of a trait

    • The one that is expressed phenotypically over other alleles

    Correct Answer
    A. The one that is expressed phenotypically over other alleles
    Explanation
    A dominant allele is the one that is expressed phenotypically over other alleles. This means that when an individual has a dominant allele for a particular trait, that trait will be expressed in their phenotype, regardless of whether they also have a recessive allele for the same trait. In Mendelian genetics, dominant alleles are represented by uppercase letters, while recessive alleles are represented by lowercase letters.

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  • 16. 

    In Mendelian genetics, a recessive allele is?

    • Uncommon

    • Only expressed phenotypically if homozygous

    • Less fit

    • The one that codes for abnormal traits

    Correct Answer
    A. Only expressed phenotypically if homozygous
    Explanation
    A recessive allele is only expressed phenotypically if an individual has two copies of it, meaning they are homozygous for that allele. This is because the dominant allele will mask the expression of the recessive allele in heterozygous individuals. Therefore, individuals with only one copy of the recessive allele will not show the trait associated with it.

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  • 17. 

    Homozygous means?

    • Having the same alleles in a pair

    • Producing identical twins

    • Having two different alleles in a pair

    • Producing similar zygotes at fertilization

    Correct Answer
    A. Having the same alleles in a pair
    Explanation
    Homozygous refers to having the same alleles in a pair. This means that both alleles for a particular trait are identical, whether they are dominant or recessive. For example, if an individual has two copies of the dominant allele for eye color (BB), they would be homozygous for that trait. Similarly, if an individual has two copies of the recessive allele for eye color (bb), they would also be homozygous.

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  • 18. 

    Heterozygous means?

    • Having the same alleles in a pair

    • Producing identical twins

    • Having two different alleles in a pair

    • Producing similar zygotes at fertilization

    Correct Answer
    A. Having two different alleles in a pair
    Explanation
    Heterozygous refers to having two different alleles in a pair. Alleles are alternative forms of a gene that occupy the same position on a chromosome. In a heterozygous individual, each allele in a pair may code for a different trait or characteristic. This is in contrast to homozygous individuals, who have identical alleles in a pair.

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  • 19. 

    Gametes are?

    • Fertilized egg cells

    • Individual genetic expressions that combine at fertilization

    • Sex cells like sperm and eggs

    • Another name for the genetic variants known as alleles

    Correct Answer
    A. Sex cells like sperm and eggs
    Explanation
    Gametes are sex cells like sperm and eggs. They are responsible for sexual reproduction and carry half the genetic information of an individual. During fertilization, a sperm and an egg combine to form a fertilized egg cell, which develops into a new organism. Therefore, the correct answer is sex cells like sperm and eggs.

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  • 20. 

    Humans have approximately _________ genes.

    • 3 billion

    • 1 million

    • 500,000

    • 20,000

    Correct Answer
    A. 20,000
    Explanation
    Humans have approximately 20,000 genes. Genes are segments of DNA that contain the instructions for building and maintaining the body. They determine traits such as eye color, height, and susceptibility to certain diseases. The human genome, which is the complete set of genetic information, was sequenced and it was found that it contains around 20,000 protein-coding genes. These genes play a crucial role in the development and functioning of the human body.

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  • 21. 

    A species is best defined as?

    • A kind of living organism

    • A group of organisms that looks completely different from others

    • A group of organisms with similar adaptations

    • A reproductively isolated group of organisms

    Correct Answer
    A. A reproductively isolated group of organisms
    Explanation
    A species is best defined as a reproductively isolated group of organisms. This means that members of the same species are able to interbreed and produce fertile offspring, while being unable to reproduce with members of other species. This definition emphasizes the importance of reproductive barriers in maintaining distinct species and highlights the role of genetic isolation in the evolution and diversification of different species.

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  • 22. 

    The study of environmental relationships is called?

    • Evolution

    • Ecology

    • Adaptation

    • Descent with modification

    Correct Answer
    A. Ecology
    Explanation
    Ecology is the study of environmental relationships, including the interactions between organisms and their surroundings. It focuses on understanding how organisms interact with each other and with their physical environment. Evolution, adaptation, and descent with modification are related concepts in biology, but they do not specifically refer to the study of environmental relationships. Therefore, the correct answer is Ecology.

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  • 23. 

    The set of natural features to which an organism is adapted and the way in which it is adapted is known as its?

    • Habitat

    • Ecosystem

    • Niche

    • Environment

    Correct Answer
    A. Niche
    Explanation
    An organism's niche refers to the specific set of natural features in its habitat to which it is adapted and the way in which it is adapted. It includes the organism's role in the ecosystem, its interactions with other species, and its specific requirements for survival and reproduction. The niche determines the organism's place and function within the ecosystem, and it is crucial for its overall fitness and success.

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  • 24. 

    A set of directly interacting habitats make up a(an)?

    • Society

    • Ecosystem

    • Niche

    • Environment

    Correct Answer
    A. Ecosystem
    Explanation
    A set of directly interacting habitats make up an ecosystem. Ecosystem refers to a community of living organisms (plants, animals, and microorganisms) in conjunction with the non-living components of their environment (such as air, water, and soil), interacting as a system. The habitats within an ecosystem are interconnected and depend on each other for survival. This includes the relationships between different species, as well as the flow of energy and nutrients within the ecosystem.

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  • 25. 

    The study of how an animal is adapted should focus on its?

    • Behavior

    • Anatomy

    • Physiology

    • Communication System

    Correct Answer
    A. Behavior
    Explanation
    The study of how an animal is adapted should focus on its behavior because behavior plays a crucial role in an animal's survival and reproductive success. By studying an animal's behavior, researchers can understand how it interacts with its environment, finds food, avoids predators, and mates. Behavior also influences an animal's social interactions and communication strategies. Therefore, understanding an animal's behavior is essential for comprehending its adaptation strategies and overall survival in its specific ecological niche.

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  • 26. 

    The "descent" part of descent with modification means that?

    • Organisms are evolving toward more complex forms

    • Older fossils are usually found in lower layers of rock

    • Organisms are all closely related

    • Existing species give rise to new species

    Correct Answer
    A. Existing species give rise to new species
    Explanation
    The "descent" part of descent with modification refers to the idea that existing species give rise to new species. This concept is central to the theory of evolution, which states that over time, species change through a process of descent from common ancestors and the accumulation of small genetic variations. This process leads to the formation of new species as populations diverge and adapt to different environments.

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  • 27. 

    The "modification" part of descent with modification means that?

    • Humans have learned how to modify living organisms and their genes

    • Species can modify themselves to become better adapted

    • Evolution has changed recently as a result of human intervention

    • Species change through time as a result of a number of natural processes

    Correct Answer
    A. Species change through time as a result of a number of natural processes
    Explanation
    The correct answer is that species change through time as a result of a number of natural processes. This means that over time, species undergo changes in their characteristics and traits due to various natural processes such as natural selection, genetic mutation, and genetic drift. These changes in species occur gradually and accumulate over generations, leading to the diversity of life forms we see today.

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  • 28. 

    Which of the following supplies concrete evidence for the fact of evolution?

    • The universality of DNA among living organisms

    • The use of amino acids to build proteins among all organisms

    • The fossil record

    • The ecological relationships among organisms

    Correct Answer
    A. The fossil record
    Explanation
    The fossil record provides concrete evidence for the fact of evolution because it shows the existence of extinct species and the gradual changes in species over time. Fossils provide a physical record of past life forms and their characteristics, allowing scientists to study and compare them to present-day species. By analyzing the fossil record, scientists can observe the progression of different species and the development of new traits, supporting the idea of evolution and common ancestry.

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  • 29. 

    The stratigraphic record shows us which general relationship between layers and time?

    • The deeper the layer the older it is

    • Layers closer to the surface are older

    • Thicker layers are older than thinner ones

    • All layers were laid down at about the same time

    Correct Answer
    A. The deeper the layer the older it is
    Explanation
    The correct answer is that the deeper the layer, the older it is. This is because in the stratigraphic record, layers of sedimentary rock are deposited in a sequential manner over time. As new layers are formed on top of older layers, the older layers are pushed deeper into the Earth's crust. Therefore, the deeper layers contain the oldest rocks and fossils, while the layers closer to the surface are more recent. Thicker layers can also indicate a longer period of deposition, making them older than thinner layers.

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  • 30. 

    Which of the following evolutionary trends is NOT demonstrated by the fossil record?

    • Increase in the range of diversity

    • Increase in kinds of complex living things

    • Evolution of one type of organism from another

    • General evolution of more and more human-like characteristics

    Correct Answer
    A. General evolution of more and more human-like characteristics
    Explanation
    The correct answer is "general evolution of more and more human-like characteristics". This is not demonstrated by the fossil record because the fossil record shows the evolution of various species and the development of different traits, but it does not specifically show a continuous progression towards human-like characteristics. The fossil record reveals a diverse range of species and their adaptations, but it does not provide evidence for a linear progression towards humans.

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  • 31. 

    The major process that explains descent with modification is:

    • Adaptation

    • Genetic inheritance

    • Natural selection

    • Evolution

    Correct Answer
    A. Natural selection
    Explanation
    Natural selection is the major process that explains descent with modification. It is the mechanism by which certain heritable traits become more or less common in a population over time, based on their impact on survival and reproduction. Individuals with advantageous traits are more likely to survive and pass on those traits to their offspring, while individuals with less advantageous traits are less likely to survive and reproduce. This leads to changes in the genetic makeup of a population over generations, resulting in the evolution of new species.

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  • 32. 

    Artificial selection refers to:

    • Hypothetical examples of selection

    • Selection operating on human beings

    • Processes that appear to be selection but are not

    • Selection directed by human action

    Correct Answer
    A. Selection directed by human action
    Explanation
    Artificial selection refers to the process of selection that is directed by human action. This means that humans intentionally choose certain traits or characteristics in plants or animals and selectively breed them to produce offspring with those desired traits. This is different from natural selection, where the environment determines which traits are advantageous and individuals with those traits are more likely to survive and reproduce. In artificial selection, humans play the role of the environment, actively selecting and breeding individuals with desired traits to create new varieties or breeds.

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  • 33. 

    The measure of success under natural selection is:

    • How many offspring are produced

    • Whether an individual lives or dies

    • How well adapted an individual is

    • How well adapted the species is

    Correct Answer
    A. How many offspring are produced
    Explanation
    In natural selection, the measure of success is determined by how many offspring are produced. This is because the main goal of natural selection is to pass on genes to the next generation, and individuals who produce more offspring have a higher chance of passing on their genes. The number of offspring produced is a direct measure of an individual's reproductive success and their ability to contribute to the gene pool of the population. Therefore, individuals who produce more offspring are considered more successful in terms of natural selection.

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  • 34. 

    Selection that maintains the adaptive relationship between a species and its environment is:

    • Directional selection

    • Artificial selection

    • Natural selection

    • Stabilizing selection

    Correct Answer
    A. Stabilizing selection
    Explanation
    Stabilizing selection is the correct answer because it refers to the process in which individuals with average or intermediate traits are favored, while individuals with extreme traits are selected against. This type of selection helps to maintain the existing adaptive relationship between a species and its environment by reducing genetic variation and keeping the population well-suited to its environment.

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  • 35. 

    Selection that adapts a species to changed environmental circumstances is:

    • Directional selection

    • Artificial selection

    • Natural selection

    • Stabilizing selection

    Correct Answer
    A. Directional selection
    Explanation
    Directional selection is the correct answer because it refers to a type of natural selection where individuals with traits that are advantageous in a changing environment have a higher chance of survival and reproduction. This leads to a shift in the frequency of a particular trait in a population over time, as the advantageous trait becomes more common. This type of selection is often observed in response to environmental changes such as climate change or the introduction of a new predator or competitor.

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  • 36. 

    Of all species that have ever existed:

    • Most are still around

    • Most are extinct

    • Most look like they do when they first evolved

    • Only those with humanlike characteristics survived

    Correct Answer
    A. Most are extinct
    Explanation
    The correct answer is that most species that have ever existed are extinct. This is supported by scientific evidence and the fossil record, which show that the vast majority of species that have lived on Earth are no longer present today. Extinction is a natural process that occurs over time, and new species constantly evolve to replace those that go extinct. Therefore, it is accurate to say that most species are extinct.

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  • 37. 

    Mutations are:

    • Always harmful

    • Always more beneficial than previous forms of a gene

    • The source of new genetic variation

    • Produced only when there is increased radiation or pollution

    Correct Answer
    A. The source of new genetic variation
    Explanation
    Mutations are the source of new genetic variation because they introduce changes in the DNA sequence. These changes can lead to new traits or characteristics, allowing organisms to adapt and evolve over time. While mutations can sometimes be harmful, they can also be beneficial or have no significant effect. Therefore, mutations are not always harmful or always more beneficial than previous forms of a gene. Additionally, mutations can occur naturally and are not solely produced by increased radiation or pollution.

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  • 38. 

    When genes are exchanged or mixed between populations within a species, the process is called:

    • Gene flow

    • Genetic drift

    • Fission

    • The founder effect

    Correct Answer
    A. Gene flow
    Explanation
    Gene flow refers to the movement or exchange of genes between different populations of the same species. This can occur through migration or interbreeding, where individuals from one population mate with individuals from another population. As a result, genetic variation is introduced into the populations, leading to the mixing of gene pools. Gene flow helps to maintain genetic diversity within a species and can counteract the effects of genetic drift or other factors that may lead to genetic differentiation between populations.

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  • 39. 

    When a population splits into two or more new populations the process is called:

    • Gene flow

    • Founder effect

    • Fission

    • Gamete sampling

    Correct Answer
    A. Fission
    Explanation
    Fission is the correct answer because it refers to the process of a population splitting into two or more new populations. This can occur when a group of individuals becomes geographically isolated or when subgroups within a population become reproductively isolated from each other. Fission can lead to the formation of new species over time as the isolated populations accumulate genetic differences and evolve independently.

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  • 40. 

    Fission produces populations that:

    • Are genetically identical

    • Will eventually become separate species

    • Are usually less well adapted than the original population

    • Have different sets of genetic combinations

    Correct Answer
    A. Have different sets of genetic combinations
    Explanation
    Fission is a type of asexual reproduction where an organism splits into two or more separate individuals. This process leads to the formation of new populations that have different sets of genetic combinations. As the original organism divides, each new individual receives a unique combination of genes, resulting in genetic diversity within the new populations. Therefore, the correct answer is that fission produces populations with different sets of genetic combinations.

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  • 41. 

    When new sets of genetic combinations result from population fissioning, the result is called:

    • Gene flow

    • Genetic drift

    • The founder effect

    • Speciation

    Correct Answer
    A. The founder effect
    Explanation
    The founder effect occurs when a small group of individuals separates from a larger population and establishes a new population with a different genetic composition. This can happen due to migration, colonization, or other events that isolate a group from the main population. The new population may have a reduced genetic diversity compared to the original population, as it is derived from a small subset of individuals. This can lead to differences in allele frequencies and the emergence of unique genetic traits in the new population.

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  • 42. 

    The Hutterite practice of "branching out" is an example of:

    • Gene flow

    • Fission

    • Gamete sampling

    • Speciation

    Correct Answer
    A. Fission
    Explanation
    The Hutterite practice of "branching out" refers to the process in which a Hutterite colony splits into two or more separate colonies. This splitting or fission leads to the formation of new colonies that are genetically distinct from the original colony. Therefore, the correct answer for this question is fission, as it accurately describes the process of colony splitting and the formation of new colonies.

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  • 43. 

    Which of the following is NOT included under the heading of genetic drift?

    • Gene flow

    • Fission

    • Gamete sampling

    • The founder effect

    Correct Answer
    A. Gene flow
    Explanation
    Gene flow is the movement of genes from one population to another through migration and interbreeding. It is a mechanism that can increase genetic variation within a population. Genetic drift, on the other hand, refers to the random changes in allele frequencies that occur in small populations due to chance events. Fission, gamete sampling, and the founder effect are all examples of genetic drift. Therefore, gene flow is not included under the heading of genetic drift.

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  • 44. 

    The form of genetic change that involves genes not being sampled representatively when parents produce offspring is

    • Gene flow

    • Fission

    • Gamete sampling

    • The founder effect

    Correct Answer
    A. Gamete sampling
    Explanation
    Gamete sampling refers to the process in which genes are not sampled representatively when parents produce offspring. This can occur due to various factors, such as random chance or genetic mutations. It can lead to changes in the gene pool of a population over time, as certain genes become more or less common. This process is different from gene flow, which involves the movement of genes between different populations, and the founder effect, which occurs when a small group of individuals establishes a new population with a limited genetic diversity. Fission, on the other hand, refers to the splitting of a population into two or more separate populations.

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  • 45. 

    In general, speciation occurs when:

    • Part of a species decides to stop reproducing with the rest of the species

    • A species gets spread out into a wide range of environments

    • A big mutation instantly produces a new species

    • A portion of a species becomes reproductively isolated from the rest

    Correct Answer
    A. A portion of a species becomes reproductively isolated from the rest
    Explanation
    Speciation occurs when a portion of a species becomes reproductively isolated from the rest. This means that a group of individuals within a species becomes unable to reproduce with the rest of the species, leading to the formation of a new species over time. Reproductive isolation can occur due to various factors such as geographical barriers, behavioral differences, or genetic changes. This isolation prevents gene flow between the two groups, allowing for genetic divergence and the development of distinct characteristics in each group.

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  • 46. 

    A macromutation is a mutation that:

    • Involves a large number of genes

    • Is lethal

    • Results in extensive physical effects

    • Produces a much better adaptive trait

    Correct Answer
    A. Results in extensive physical effects
    Explanation
    A macromutation is a type of mutation that causes extensive physical effects. This means that it results in significant changes or alterations in the physical characteristics or traits of an organism. Unlike other types of mutations that may only cause minor changes, a macromutation has a more pronounced and noticeable impact on the organism's phenotype. It does not necessarily involve a large number of genes or result in a better adaptive trait, but rather focuses on the extent of physical changes caused by the mutation.

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  • 47. 

    We may best picture the relationships among all species as:

    • A ladder of increasing complexity

    • A chain of species going from least to most perfect

    • A tree with a few branches

    • A dense bush with countless branches and twigs

    Correct Answer
    A. A dense bush with countless branches and twigs
    Explanation
    The correct answer is a dense bush with countless branches and twigs. This analogy suggests that the relationships among all species are complex and interconnected, similar to the branches and twigs of a bush. It implies that there are numerous species with varying degrees of complexity, rather than a linear progression or a small number of branches.

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  • Mar 21, 2023
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  • Jul 03, 2015
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