Genetics - Principles of Heredity: Homework Help Chapter Exam

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Question 1 1. The following results were observed from a mating between two black and white speckled cats: 5 black cats, 12 black and white speckled cats, and 4 white cats. Which term describes the relationship between the alleles of the coat color gene?

Question 2 2. Sarah has blonde hair even though both of her parents have brown hair. In old photos she has seen that both her parents' mothers had blonde hair before it went white. Given this information what can you suggest about the dominance of the different hair color genes?

Question 3 3. Alleles A and B are linked on chromosome 1 (such that you have A-B and a-b). Alleles C and D are linked on chromosome 2 (you have C-D and c-d). If a crossover event does not occur between either set of genes, which gamete genotype could NOT be produced by an individual heterozygous at each locus?

Question 4 4. Which of the following is NOT an example of a homozygous genotype?

Question 5 5.

Which of the following statements is true?

I. The one thousandth base pair on chromosome one of an organism is an example of a locus.

II. Changing the DNA in a gene by one base pair could create a new allele.

III. Cells in a diploid organism possess two copies of each homolog (except gametes).

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Question 6 6.

Genes A and B are located on the same chromosome arm in the following orientation: centromere, gene A, gene B, telomere. Which of the following recombinant chromatids could be produced by a crossover event between B genes in a heterozygote in which the dominant alleles are linked on one homolog and the recessive ones are linked on the other homolog?

I. A B

II. a B

III. A b

IV. a b

Question 7 7. Alleles A, B, C and D are linked on one chromosome, and alleles a, b, c and d are linked on the homolog. During meiosis, a crossover event occurs between genes A and B. Which of the following is an example of a chromatid that could be found in one of the resulting gametes?

Question 8 8.

Which of the following statements is/are true?

I. A human with an X chromosome and a Y chromosome is male.

II. A human with only one type of sex chromosome (an X chromosome) is female.

III. All children of a color blind woman and a man who is not color blind will carry a color blind allele.

Question 9 9.

Which of the following statements is true?

I. A dihybrid cross is a cross between individuals heterozygous at one gene.

II. The law of independent assortment describes the relationship between alleles of a single gene.

III. The law of segregation describes the manner in which genes on different chromosomes segregate.

IV. Homologous chromosomes segregate into different gametes.

Question 10 10.

If gene A is located on chromosome 1 and gene B is located on chromosome 2, which of the following genotypic frequencies could be produced among the progeny of the following cross: AABb x aaBb

I. 25% AaBB, 50% AaBb and 25% Aabb

II. 75% AaBB

III. 25% bb

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Question 11 11. A scientist is studying an animal and determines that a gene is located on autosome two. It controls antler production in the male animals. Note that females do not produce antlers. This is an example of a:

Question 12 12. A scientist is studying an animal which can be found with either black or white fur. Which of following could be FALSE in this study?

Question 13 13. Two animals heterozygous at gene A are mated. What ratio of genotypes will be produced in the offspring?

Question 14 14. Gregor Mendel proposed which of the following concepts?

Question 15 15. Which type of dominance describes a situation in which heterozygotes demonstrate a phenotype which is intermediate between the homozygotes?

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Question 16 16. Which of the following statements could NOT be used to describe a multifactorial trait?

Question 17 17.

You could draw which of the following conclusions from a dihybrid cross which produces a 9:3:3:1 ratio of phenotypes?

I. The alleles of one gene sort independently of another gene.

II. The alleles of the two genes in question exhibit a simple dominant/recessive relationship.

III. The animals which were crossed were both homozygous with respect to at least one locus in question.

Question 18 18. Which of the following is NOT an example of a phenotype?

Question 19 19. Consider the following experiment: A scientist determines that the number of dorsal spines of her experimental fish is determined by a single locus. She mates a fish with 1 dorsal spine with a fish of the same species with 2 dorsal spines. The mating produces ten fish, which all have 1 dorsal spine. Which of the following statements does not fit with this result?

Question 20 20. Which phenotype(s) do the red blood cells from a person with AB blood type exhibit?

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Question 21 21.

Evaluate each of the following sets of data separately. Which of them provide evidence that the trait is polygenic?

I. The genotype at loci A, B and C each produces a protein that influences the length of an organism by an average of 0.6, 0.4 and 0.3 cm, respectively.

II. Three different alleles of gene D affect the length of an organism by an average of 0.6, 0.4 and 0.3 cm, respectively.

III. Loci E, F and G each modulates an independent pathway, which plays a role in determining the length of an organism.

Question 22 22. Which of the following statements does NOT help explain Mendel's law of segregation?

Question 23 23.

Hemophilia is an X-linked recessive trait. Consider a cross between a woman who is a carrier and a man who suffers from hemophilia. Which of the following statements is/are true?

I. All sons of these parents will be a hemophiliac.

II. A son who suffers from hemophilia received the hemophilia allele from his mother.

III. Half of the daughters of this cross are predicted to be hemophiliacs.

Question 24 24. Which of the following crosses most likely produced the following results, where B=blue, b=green, H=two-horned and h=one-horned: 54 blue, two-horned lizards, 18 blue, one-horned lizards, 18 green, two-horned lizards, and 6 green, one-horned lizards?

Question 25 25.

Which of the following statement(s) accurately describes an advantage provided by model organisms?

I. The laboratory environment can be controlled.

II. True-breeding strains can be generated.

III. Specific combinations of alleles can be engineered.

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Question 26 26. Incomplete dominance governs the pigment gene of a flower. A mating between heterozygotes yields the following phenotypic ratio: 15 red flowers, 32 pink flowers and 14 white flowers. Which statement describes the situation?

Genetics - Principles of Heredity: Homework Help Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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