Unit 3 Test: Rebate
Questions and Answers
- 1.
A plant that is homozygous for red flowers (rr) is crossed with a plants that is homozygous for white flowers (ww). In the case of incomplete dominance, the flowers of the offspring will be ___.
- A.
Red and white
- B.
White only
- C.
Red only
- D.
Pink only
Correct Answer
D. Pink onlyExplanation
When a plant that is homozygous for red flowers is crossed with a plant that is homozygous for white flowers, and incomplete dominance is present, the flowers of the offspring will be pink only. In incomplete dominance, neither of the alleles is completely dominant over the other, resulting in a blending of traits. In this case, the red allele and the white allele will mix together to produce pink flowers in the offspring.Rate this question:
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- 2.
An allele is dominant in a heterozygote when it is
- A.
Expressed and the other allele is not.
- B.
A very common allele in the population.
- C.
The weaker of the two alleles.
- D.
More desirable than the other allele.
Correct Answer
A. Expressed and the other allele is not.Explanation
In genetics, an allele is a variant form of a gene. When an allele is dominant in a heterozygote, it means that its trait is expressed and the trait of the other allele is not. This means that the dominant allele will determine the phenotype or physical appearance of the organism, while the recessive allele remains hidden. The dominance of an allele is not determined by its frequency in the population or its desirability, but rather by its ability to be expressed over the recessive allele.Rate this question:
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- 3.
Which law states that organisms inherit two copies of each gene and donate one copy to each of their offspring?
- A.
Law of genetic linkage
- B.
Law of segregation
- C.
Law of independent assortment
- D.
Law of inheritance
Correct Answer
B. Law of segregationExplanation
The law of segregation states that organisms inherit two copies of each gene and donate one copy to each of their offspring. This means that during the formation of reproductive cells, the two copies of each gene separate from each other and only one copy is passed on to the offspring. This law explains how traits are passed down from parents to their offspring in a predictable manner.Rate this question:
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- 4.
Mendel's second law of genetics, the law of independent assortment, is one explanation of the
- A.
Random fertilization of gametes.
- B.
Genetic variation within species.
- C.
Greater strength of dominant alleles.
- D.
Final stages of gametogenesis.
Correct Answer
B. Genetic variation within species.Explanation
Mendel's second law of genetics, the law of independent assortment, states that during gamete formation, the alleles for different traits segregate independently of each other. This means that the inheritance of one trait does not affect the inheritance of another trait. This process leads to a random combination of alleles in gametes, resulting in genetic variation within a species. Therefore, the correct answer is genetic variation within species.Rate this question:
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- 5.
For an XX female to express a recessive sex-linked trait, she must have
- A.
A Y chromosome.
- B.
An inactivated allele.
- C.
Two recessive alleles.
- D.
Two dominant alleles.
Correct Answer
C. Two recessive alleles.Explanation
For an XX female to express a recessive sex-linked trait, she must have two recessive alleles. In females, the presence of two X chromosomes usually masks the expression of recessive sex-linked traits. However, if both X chromosomes carry the recessive allele for the trait, there is no dominant allele to mask its expression. Therefore, the recessive trait will be expressed in the XX female. The presence of a Y chromosome is not necessary for the expression of a recessive sex-linked trait in females.Rate this question:
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- 6.
A child is born with attached earlobes, which is a recessive phenotype. Which of the following genotypes could the parents have?
- A.
RR and RR
- B.
Rr and RR
- C.
Rr and rr
- D.
RR and rr
Correct Answer
C. Rr and rrExplanation
The child is born with attached earlobes, which is a recessive phenotype. This means that in order for the child to have attached earlobes, both parents must carry the recessive allele for attached earlobes. The genotype Rr and rr is the only option where one parent carries the recessive allele (rr) and the other parent carries at least one dominant allele (R). Therefore, this is the only possible combination of genotypes that could result in the child having attached earlobes.Rate this question:
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- 7.
Any of the alternative forms of a gene that occurs at a specific place on a chromosome are known as ___.
- A.
Alleles
- B.
Genes
- C.
Chromosomes
- D.
Recessive traits
Correct Answer
A. AllelesExplanation
Alleles are alternative forms of a gene that occur at a specific place on a chromosome. They are responsible for the variations observed in traits among individuals. Genes refer to the units of heredity that determine specific characteristics, while chromosomes are structures that carry genes. Recessive traits are specific expressions of genes that are only observed when an individual has two copies of the recessive allele. Therefore, the correct answer is alleles.Rate this question:
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- 8.
___ studied traits of pea plants and discovered the two fundamental laws of genetics.
- A.
Mendel
- B.
Watson and Crick
- C.
Mack
- D.
Einstein
Correct Answer
A. MendelExplanation
Mendel is the correct answer because he is known for his studies on pea plants and his discovery of the two fundamental laws of genetics, which are the law of segregation and the law of independent assortment. Mendel's experiments with pea plants laid the foundation for modern genetics and his findings were groundbreaking in understanding how traits are inherited.Rate this question:
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- 9.
In humans, a ___ cell has ___ chromosomes.
- A.
Haploid ... 46
- B.
Haploid ... 23
- C.
Diploid ... 50
- D.
Diploid ... 23
Correct Answer
B. Haploid ... 23Explanation
In humans, a haploid cell has 23 chromosomes. Haploid cells are cells that contain only one set of chromosomes, which is half the number of chromosomes found in diploid cells. Humans have a diploid number of 46 chromosomes, meaning that each diploid cell contains two sets of 23 chromosomes. Therefore, the correct answer is haploid with 23 chromosomes.Rate this question:
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- 10.
Homologous chromosomes exchange information from time to time through a process called crossing over. During which stage of meiosis does this occur?
- A.
Prophase I
- B.
Metaphase II
- C.
Prophase II
- D.
Telophase I
Correct Answer
A. Prophase IExplanation
During Prophase I of meiosis, homologous chromosomes pair up and exchange genetic information through a process called crossing over. This is a crucial step in meiosis as it leads to genetic variation by shuffling genetic material between the homologous chromosomes. It occurs before the separation of the homologous chromosomes during Anaphase I and is not observed in the subsequent stages of meiosis (Metaphase II, Prophase II, and Telophase I).Rate this question:
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- 11.
The cells in the ovaries and testes that actually go through meiosis to produce haploid cells are called ___.
- A.
Germ cells
- B.
Oocytes
- C.
Spermatocytes
- D.
Gametes
Correct Answer
A. Germ cellsExplanation
Germ cells are the cells in the ovaries and testes that undergo meiosis to produce haploid cells. Oocytes are immature eggs in the ovaries, spermatocytes are immature sperm cells in the testes, and gametes are the mature haploid cells that are produced through meiosis. However, the specific cells that actually go through meiosis are called germ cells.Rate this question:
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- 12.
A form of nuclear division that divides a diploid cell into haploid cells and produces gametes is known as ___.
- A.
Mitosis
- B.
Meiosis
- C.
Cellular regeneration
- D.
Binary fission
Correct Answer
B. MeiosisExplanation
Meiosis is a form of nuclear division that occurs in diploid cells and results in the production of haploid cells, specifically gametes. This process involves two rounds of division, resulting in four genetically unique daughter cells. Unlike mitosis, which produces identical daughter cells, meiosis plays a crucial role in sexual reproduction by creating genetic diversity through the shuffling and recombination of genetic material. Cellular regeneration refers to the process of repairing or replacing damaged or lost cells, while binary fission is a form of asexual reproduction commonly observed in prokaryotes.Rate this question:
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- 13.
A female gamete ___.
- A.
Is produced in the testes.
- B.
Is called an ovum or an egg cell.
- C.
Is called a spermatocyte.
- D.
Is called a polar body.
Correct Answer
B. Is called an ovum or an egg cell.Explanation
The female gamete is called an ovum or an egg cell. The term "ovum" refers to the mature female reproductive cell, which is released from the ovary during ovulation and can be fertilized by a sperm cell to form a zygote. The term "egg cell" is another commonly used term to describe the female gamete. Both terms are used interchangeably to refer to the same reproductive cell in females.Rate this question:
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- 14.
Cells that have only one copy of an organisms chromosomes are said to be ___.
- A.
Somatic cells
- B.
Diploid cells
- C.
Haploid cells
- D.
Binary cells
Correct Answer
C. Haploid cellsExplanation
Haploid cells are cells that have only one copy of an organism's chromosomes. This means that they contain only one set of chromosomes, while diploid cells have two sets. Somatic cells refer to any cells in the body that are not involved in reproduction. Binary cells is not a recognized term in biology. Therefore, the correct answer is haploid cells.Rate this question:
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- 15.
Cells that are produced by germ cells through the process of meiosis are called ___.
- A.
Somatic cells
- B.
Gametes
- C.
Diploid cells
- D.
Binary cells
Correct Answer
B. GametesExplanation
Germ cells undergo the process of meiosis to produce gametes. Gametes are reproductive cells, such as eggs and sperm, that contain half the number of chromosomes as somatic cells. This reduction in chromosome number is necessary for sexual reproduction, as it ensures that when gametes combine during fertilization, the resulting offspring will have the correct number of chromosomes. Therefore, the correct answer is gametes.Rate this question:
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- 16.
Messenger RNA is formed in the process of ___.
- A.
Transcription
- B.
Translation
- C.
Replication
- D.
Mutation
Correct Answer
A. TranscriptionExplanation
Messenger RNA is formed in the process of transcription. Transcription is the process by which the DNA sequence in a gene is copied into a complementary RNA molecule. In this process, an enzyme called RNA polymerase binds to the DNA template strand and synthesizes a complementary RNA molecule. This RNA molecule, known as messenger RNA (mRNA), carries the genetic information from the DNA to the ribosomes, where it is used as a template for protein synthesis during translation. Therefore, transcription is the correct process for the formation of messenger RNA.Rate this question:
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- 17.
Watson and Crick, with the help of Rosalind Franklin, were the first to suggest that DNA is ___.
- A.
A short molecule
- B.
A protein molecule
- C.
The shape of a double helix
- D.
The genetic material
Correct Answer
C. The shape of a double helixExplanation
Watson and Crick, along with the assistance of Rosalind Franklin, proposed that DNA has the structure of a double helix. This means that DNA is shaped like a twisted ladder, with two strands that are connected by pairs of nucleotides. This discovery was a groundbreaking achievement in the field of genetics and laid the foundation for our understanding of how DNA carries and transmits genetic information.Rate this question:
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- 18.
Which of the following statements about DNA and RNA is true?
- A.
RNA is arranged in a double helix.
- B.
The kinds of sugar in the nucleotides of DNA and RNA differ.
- C.
DNA contains nitrogenous bases and phosphates, while RNA does not.
- D.
DNA contains uracil, while RNA contains thymine.
Correct Answer
B. The kinds of sugar in the nucleotides of DNA and RNA differ.Explanation
The statement "The kinds of sugar in the nucleotides of DNA and RNA differ" is true. DNA contains deoxyribose sugar in its nucleotides, while RNA contains ribose sugar. This difference in sugar composition is one of the key distinctions between DNA and RNA. DNA is composed of deoxyribose sugar, phosphate groups, and nitrogenous bases (adenine, thymine, cytosine, and guanine), while RNA is composed of ribose sugar, phosphate groups, and nitrogenous bases (adenine, uracil, cytosine, and guanine).Rate this question:
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- 19.
What does the circle represent in this diagram of a nucleotide?
- A.
Phosphate group
- B.
Nitrogenous base
- C.
Pentose sugar
- D.
Adenine base
Correct Answer
A. Phosphate groupExplanation
The circle in the diagram of a nucleotide represents the phosphate group. A nucleotide is composed of three main components: a phosphate group, a nitrogenous base, and a pentose sugar. The phosphate group is a key component of nucleotides as it forms the backbone of the DNA or RNA molecule. It plays a crucial role in the structure and stability of the nucleotide and helps in the formation of the DNA double helix.Rate this question:
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- 20.
Which of the following is a pair of complementary bases?
- A.
Cytosine and cytosine
- B.
Thymine and adenine
- C.
Adenine and guanine
- D.
Thymine and ctyosine
Correct Answer
B. Thymine and adenineExplanation
Thymine and adenine are a pair of complementary bases. In DNA, these two bases always pair together through hydrogen bonds, forming a stable double-stranded structure. Thymine always pairs with adenine, and cytosine always pairs with guanine. This complementary base pairing is essential for DNA replication and transcription, as it ensures accurate copying and reading of the genetic code.Rate this question:
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