Cp Bio 2 Final Exam Review 2 (Spring 2014)

Variations refer to the differences that exist between members of the same species. These differences can be observed in various traits such as physical appearance, behavior, or genetic makeup. Variations can occur due to genetic factors, environmental factors, or a combination of both. They play a crucial role in the process of natural selection, as individuals with certain variations may be better adapted to their environment and have a higher chance of survival and reproduction.

Scientists often take dirt samples from the area around the fossil find to help determine the relative age of the fossil. By analyzing the layers of soil and sediment around the fossil, scientists can establish the geological context and determine the age of the fossil relative to the surrounding materials. This information is crucial in understanding the timeline of Earth's history and the evolution of species.

The presence of vestigial pelvic bones and lungs in modern whales suggests that their ancestors lived on land. These features are remnants of their terrestrial heritage, indicating that whales evolved from land-dwelling mammals. The transition from land to water occurred over millions of years, with whales gradually adapting to an aquatic lifestyle. This evidence supports the theory of evolution and the idea that species can change and adapt over time.

Charles Darwin found fossils that looked like ancient versions of living species. This suggests that these species had evolved over a long period of time, indicating that Earth must be much more than 6000 years old. This is because the process of evolution takes a significant amount of time for new species to emerge from older ones. Therefore, Darwin's discovery of these fossils supports the idea that Earth is much older than 6000 years.

Adaptation refers to a feature that allows an organism to survive better in its environment. This can include physical traits, behaviors, or physiological processes that enhance an organism's ability to find food, avoid predators, reproduce, or withstand environmental conditions. Adaptations are the result of natural selection acting on heritable variations within a population over time, leading to the better adaptation of individuals to their specific environment.

The correct answer is "a trace of an organism that existed in the past". A fossil is any preserved evidence of an organism that lived in the past, such as bones, shells, footprints, or imprints. It provides valuable information about ancient life forms and the history of the Earth.

The fact that large, flightless birds are found on different continents supports the theory of evolution through biogeography. This is because the presence of similar species in geographically isolated areas suggests that they evolved from a common ancestor and then diverged due to geographical barriers. The distribution of these birds across different continents indicates that they have adapted to different environments and evolved independently in response to local conditions. This observation aligns with the principles of evolution and biogeography, providing evidence for the theory.

A population refers to a group of individuals of the same species that inhabit the same geographic area. This term specifically focuses on a particular species and their collective presence within a given region. It does not include other species or groups such as breeding families or communities, which encompass a wider range of organisms.

Both plants and green algae have cell walls made of cellulose. Cellulose is a complex carbohydrate that provides structural support to the cell walls of these organisms. It is a rigid and strong material that helps maintain the shape and integrity of the cell. Silica is more commonly found in the cell walls of diatoms, chitin is found in the cell walls of fungi and arthropods, and agar is a gelatinous substance derived from algae that is used in laboratories for culturing microorganisms.

Two organisms that are closely related would have very similar DNA sequences because DNA is the genetic material that carries the instructions for all the traits and characteristics of an organism. Organisms that are closely related share a common ancestor and therefore have a high degree of similarity in their DNA sequences. This similarity in DNA sequences reflects their evolutionary relationship and the genetic similarities they have inherited from their common ancestor.

The development of a new color in a rose through artificial selection means that scientists intentionally bred roses with specific traits, including color, to create a new variety. This process involves selecting individuals with the desired color and breeding them together, repeating the process over generations until the desired color is achieved. Natural selection refers to the process where individuals with advantageous traits are more likely to survive and reproduce, leading to the evolution of a population. Descent with modification refers to the passing of traits from parent to offspring over generations. Overproduction refers to the production of more offspring than can survive, leading to competition for resources and natural selection.

Hominids are a group of primates that includes humans and their closest relatives. They are characterized by various traits that distinguish them from other primates. One of these characteristics is the presence of opposable thumbs, which allows them to grasp objects and manipulate their environment. Another characteristic is having large brains, which is associated with higher cognitive abilities. Additionally, hominids are known for walking upright, a unique form of locomotion that sets them apart from other primates. However, hominids do not possess prehensile tails, which are long and flexible tails that can be used for grasping objects. Therefore, the absence of prehensile tails is the correct answer as it is not a characteristic of hominids.

Oncology is the study of cancer, which focuses on the diagnosis and treatment of the disease. It does not directly provide evidence for evolution as it does not explore the changes in species over time or the common ancestry of organisms. On the other hand, biogeography studies the distribution of species, embryology investigates the development of embryos, and paleontology examines fossils to understand the history of life on Earth. These three branches of science provide evidence for evolution through their respective fields of study.

A species is a term used to describe a group of similar organisms that have the ability to reproduce with each other and produce fertile offspring. This is because members of the same species share similar genetic traits and can interbreed successfully. In contrast, individuals refer to single organisms, populations refer to groups of individuals of the same species in a specific area, and fossils are the preserved remains or traces of past organisms.

Lucy, the ancient bipedal hominid, is a member of the species Australopithecus aferensis.

The correct answer is prosimians. Prosimians are considered the oldest living primate group. They are characterized by their smaller size, reliance on smell and hearing, and their nocturnal behavior. Examples of prosimians include lemurs, lorises, and tarsiers. They are believed to have diverged from the ancestral primate group before monkeys and apes evolved.

The most common reason for finding only the skull of an ancient hominid is that scavengers can carry off the smaller bones much more easily. This is because smaller bones are lighter and easier to transport, making them more susceptible to being carried away by scavengers. In contrast, the skull is a larger and heavier bone, making it more difficult for scavengers to carry off. Therefore, it is more likely to be left behind and preserved, leading to a higher frequency of finding only the skull of an ancient hominid.

If an organism has a vestigial structure, it means that the structure is present in the organism but no longer serves a function. This suggests that the structure was functional in an earlier ancestor but has become reduced or obsolete over time. Therefore, the correct answer is "earlier ancestor."

Paleontology is the study of fossils, which are the preserved remains or traces of ancient organisms. The fact that more primitive fossils are found below more complex fossils in the rock layers supports the concept of evolution. According to the principle of superposition, in undisturbed rock layers, the lower layers are older than the upper layers. This means that the fossils found in lower layers represent organisms that lived earlier in time and were less complex, while the fossils found in higher layers represent organisms that lived later and were more complex. This pattern of fossil distribution aligns with the idea of gradual changes and increasing complexity over time, which is a key concept in evolutionary theory.

Eukaryotes are distinguished from prokaryotes by the presence of a nucleus. Prokaryotes, such as bacteria, lack a nucleus and their genetic material is not enclosed within a membrane-bound structure. In contrast, eukaryotes, which include plants, animals, fungi, and protists, have a well-defined nucleus that houses their DNA. The presence of a nucleus allows for more complex cellular processes, such as transcription and replication, to occur within the eukaryotic cell.

Homo sapiens has been on Earth for approximately 200,000 years. This is supported by scientific evidence such as fossil records and genetic studies. These studies indicate that Homo sapiens evolved in Africa around this time and gradually spread across the globe. The 200,000-year timeline aligns with the emergence of anatomically modern humans and their migration patterns. It is important to note that the other options provided (2000 years, 6 million years, and 6000 years) are incorrect and do not correspond to the established scientific consensus.

Erasmus Darwin was Charles Darwin's poetic grandfather. Erasmus was a renowned physician, naturalist, and poet who had a significant influence on Charles Darwin's scientific thinking. He was known for his writings on evolution and natural history, which laid the foundation for Charles Darwin's later work on the theory of evolution. Erasmus Darwin's poetic and scientific pursuits inspired Charles Darwin and shaped his intellectual development. Therefore, Erasmus Darwin is the correct answer in this context.

Carolus Linnaeus developed a classification system for organisms. He is often referred to as the "Father of Taxonomy" for his work in creating a system to organize and categorize living organisms based on their similarities and differences. Linnaeus introduced the use of binomial nomenclature, assigning a two-part scientific name to each species, which is still widely used in biology today. His classification system laid the foundation for modern taxonomy and greatly contributed to our understanding of the diversity and relationships among different species.

Natural selection is the process by which individuals that are better adapted to their environment have a higher chance of surviving and reproducing, passing on their advantageous traits to future generations. This leads to the gradual accumulation of beneficial traits in a population over time. Sexual selection refers to the selection of mates based on certain traits, genetic drift refers to random changes in gene frequencies, and gene flow refers to the transfer of genes between different populations.

The word "Panthera" indicates the genus of the organism in the scientific name "Panthera tigris". In binomial nomenclature, the genus is the first part of the name and it represents a group of closely related species. In this case, "Panthera" refers to the genus that includes big cats such as lions, tigers, and leopards. "Tigris" is the species name, specifically referring to the tiger. Therefore, the correct answer is "Panthera".

The correct answer is Australopithecus africanus. The Taung Child, also known as the Taung Baby, is the fossilized skull of a young Australopithecus africanus. It was discovered in 1924 in Taung, South Africa by Raymond Dart. This fossil is significant because it provided the first evidence that early hominids walked upright on two legs, challenging the prevailing belief at the time that humans evolved a large brain before bipedalism.

Evolution is the correct answer because it refers to the process of biological change over time, where descendants gradually differ from their ancestors. This process occurs through mechanisms such as natural selection, genetic mutation, and genetic drift. Evolution is a fundamental concept in biology that explains the diversity of life on Earth and how species have adapted to their environments over millions of years.

Homo neanderthalensis is the youngest of this group because it is the most recent species to have lived. Australopithecus aferensis and Australopithecus africanus are both extinct hominin species that lived millions of years ago. Homo erectus is an extinct species that lived between 1.9 million and 70,000 years ago. Homo neanderthalensis, on the other hand, lived between 400,000 and 40,000 years ago, making it the most recent species among the options given.

The correct answer is variation. Variation refers to the differences in physical traits among individuals within a group. It can include variations in characteristics such as height, eye color, or hair texture. Change refers to the process of becoming different over time, while adaptation refers to the process by which organisms adjust to their environment. Species refers to a group of organisms that can interbreed and produce fertile offspring.

Australopithecus aferensis is the oldest of this group because it is the earliest known species in the genus Australopithecus. It lived between 3.9 and 2.9 million years ago, while Australopithecus africanus lived between 3 and 2 million years ago. Homo erectus lived between 1.9 million and 143,000 years ago, and Homo neanderthalensis lived between 400,000 and 40,000 years ago. Therefore, Australopithecus aferensis predates all the other species in the group, making it the oldest.

Homo erectus is considered to be the most successful hominid species ever because it survived for 2 million years. This is an exceptionally long period of time compared to other hominid species, indicating their ability to adapt and thrive in various environments. Their longevity suggests that Homo erectus possessed advanced cognitive and physical abilities, allowing them to successfully navigate and survive in different landscapes and climates. This extended survival also allowed Homo erectus to spread across different regions, further contributing to their success as a species.

Homo neanderthalensis is the correct answer because it is the only hominid species that co-existed with Homo sapiens in Europe. Neanderthals lived in Europe and parts of Asia from about 400,000 to 40,000 years ago. They were a closely related species to Homo sapiens and had a similar level of intelligence. The presence of Neanderthals in Europe during the same time period as Homo sapiens suggests that there was some interaction and possibly interbreeding between the two species.

Paleoanthropologists study human evolution by examining various sources of evidence. Fossilized bones provide physical remains that can be analyzed to understand the physical characteristics of ancient humans. Endocasts of the brains offer insights into the size and structure of the brain. Molecular clocks help estimate the timing of evolutionary events based on genetic data. However, written historical records are not used in the study of human evolution because they only extend back a few thousand years and do not provide direct evidence of ancient humans.

A dead tree is not considered a type of fossil because it does not meet the criteria for fossilization. Fossils are formed when the remains or traces of organisms are preserved in sedimentary rock over long periods of time. A dead tree, on the other hand, decomposes relatively quickly and does not undergo the same processes of fossilization. While dead trees can leave behind impressions or imprints in sedimentary rock, these are not classified as fossils in the same way as the other options provided.

Homo habilis, also known as "Handy Man," is an ancient bipedal hominid species. This species is considered one of the earliest members of the Homo genus and is believed to have lived approximately 2.4 to 1.4 million years ago. Homo habilis is known for its tool-making abilities, which earned it the nickname "Handy Man." This species played a significant role in human evolution by demonstrating early signs of intelligence and innovation in tool use.

Catastrophism is the theory that states that floods and earthquakes have occurred often in Earth's history. This theory suggests that major geological events are the result of sudden and catastrophic events rather than gradual processes. It proposes that these events have shaped the Earth's landscape and have had a significant impact on the development of life on the planet. This theory contrasts with uniformitarianism, which suggests that geological processes occur slowly and gradually over long periods of time. Gradualism and natural selection are unrelated to the occurrence of floods and earthquakes.

Genetic variation can occur when there is a random change in the DNA of a gene, which is known as a mutation. Mutations can lead to the formation of new alleles, resulting in differences in traits within a population. This variation is essential for evolution to occur, as it provides the raw material for natural selection to act upon. Gene flow refers to the movement of genes between different populations, gene pool refers to the total collection of genes in a population, and allele refers to different versions of a gene.

Modern humans are members of the species Homo sapiens. Homo neanderthalensis, Homo habilis, and Homo erectus are all extinct species of humans that lived at different points in history. Homo sapiens is the only species that is still alive today and includes all modern humans.

Scientists have identified bipedal locomotion as the first step in human evolution. Bipedal locomotion refers to the ability to walk on two legs, which is a distinct characteristic of humans. This adaptation allowed our early ancestors to free their hands for other tasks, such as tool use and carrying objects. Bipedalism also played a crucial role in the development of other human traits, such as increased brain size and the ability to communicate through language. Therefore, bipedal locomotion is considered a fundamental characteristic that set humans apart in the evolutionary timeline.

Bipedalism is an important adaptive advantage for several reasons. It allows the hands to be freed up, enabling the use of tools, carrying food, and carrying young. However, the statement that bipedalism frees the hands to walk faster is incorrect. Bipedalism primarily allows for efficient and energy-saving locomotion, but it does not necessarily result in faster walking speed.

Hybridization refers to the crossing of two different species that share common genes. This process can result in offspring with a combination of traits from both parent species. It is a common method used in breeding to create new varieties or hybrids with desirable characteristics. This term specifically highlights the genetic exchange between species, distinguishing it from other processes such as mutation, natural selection, or sexual selection.

Homo sapiens is not a monkey because it belongs to the species of humans. Monkeys are a distinct group of primates that include baboons, lemurs, and tarsiers. While humans share a common ancestor with monkeys, they have evolved separately and belong to a different branch of the primate family tree. Therefore, Homo sapiens is not considered a monkey.

Natural selection is a process in which certain traits become more or less common in a population over time based on their ability to survive and reproduce. The selective agent refers to the factor that determines which traits are advantageous or disadvantageous in a particular environment. In this case, the correct answer is "the environment" because it is the primary factor that determines which traits are selected for or against. The environment includes various factors such as climate, availability of resources, predation, and competition, which influence the survival and reproduction of individuals with different traits.

If two organisms belong to the same order, they must also have the same phylum in common. The taxonomic hierarchy starts with the broadest category, kingdom, and narrows down to phylum, class, order, family, genus, and species. Organisms in the same order share similar characteristics and are more closely related than those in the same phylum. Therefore, if two organisms are in the same order, they must also belong to the same phylum.

Hominid species are classified into two main groups: Australopithecus and Homo. Australopithecus includes species such as Australopithecus afarensis, while Homo includes species like Homo habilis and Homo sapiens. These two groups represent different stages in the evolution of hominids, with Australopithecus being an earlier group and Homo representing more advanced species.

The correct answer is three because the question is asking about the number of domains in the current tree of life. In biology, the three domains of life are Bacteria, Archaea, and Eukarya. These domains represent the highest level of classification and encompass all known organisms. Therefore, there are three domains in the current tree of life.

The wing of an ostrich would be classified as a vestigial structure because it is a reduced or underdeveloped organ that no longer serves its original function, which is flying. Ostriches are flightless birds, and their wings have evolved to be small and non-functional for flight. These vestigial wings are remnants of their ancestors' fully functional wings, indicating a common ancestry with flying birds.

Homo erectus is believed to be the direct ancestor of modern humans. Fossil evidence suggests that Homo erectus lived from about 1.9 million to 143,000 years ago and had physical characteristics similar to modern humans. They were the first hominins to have body proportions similar to ours, with long legs and a short, broad pelvis. They also had a larger brain size compared to earlier hominins. Homo erectus is considered an important species in human evolution as they were the first to migrate out of Africa and spread to other parts of the world.