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Biology of Genetics Chapter Exam

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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Question 1 1. DNA is a polynucleotide molecule consisting of the following nucleotides:

Question 2 2. Complementary base pairing in DNA assures that only one of the following base pairs exists in DNA. Select the correct base pair.

Question 3 3. If a strand of a DNA molecule has the sequence GTCCAC, what would be the sequence of the complementary section of DNA?

Question 4 4.

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).

Question 5 5. The locus is _____.

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Question 6 6. When an organism is diploid, that means it has _____.

Question 7 7. Which two laws of Mendel help us predict how chromosomes are allotted to the gametes?

Question 8 8. A Punnett square is useful when determining phenotypic output, for all of the following reasons EXCEPT:

Question 9 9. How would you define a dihybrid cross?

Question 10 10. All of the following statements are correct EXCEPT:

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Question 11 11. 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 12 12.

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 13 13. 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 14 14. What type of organism has two copies of every gene?

Question 15 15. The trait which is not expressed in a heterozygous state is known as

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Question 16 16.

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

Question 18 18.

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.

Question 19 19. 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?

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. 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 22 22. Autosomes are:

Question 23 23. 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 24 24.

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 25 25.

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.

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Question 26 26. A _____ is a cross between two individuals that are heterozygous at two loci.

Question 27 27. The law of independent assortment states that:

Question 28 28. Let's say P is an allele that codes for purple flowers and p is an allele that codes for white flowers. A plant has alleles Pp. According to the Law of Segregation, what alleles would each gamete have?

Question 29 29.

Use a Punnett Square to figure out what percentage of pea plants would have purple flowers in the following cross:

A purple flowered pea plant (PP) crossed with a white flowered pea plant (pp).

Question 30 30. Gregor Mendel is famous for his involvement in _____.

Biology of Genetics 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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