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TExMaT Master Science Teacher 8-12: Genetics & Heredity 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.

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 2 2.

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 3 3. 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 4 4. Which of these terms accurately describes Alzheimer's disease?

Question 5 5. Which type of dominance describes a situation in which heterozygotes demonstrate a phenotype which is intermediate between the homozygotes?

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Question 6 6. 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 7 7. In humans, _____ is determined by the presence or absence of the _____ chromosome.

Question 8 8. Autosomes are:

Question 9 9.

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

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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.

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 13 13. When collecting samples to study the genetics of a complex disease, which of the following factors would you NOT want to be equally represented in both the affected and unaffected groups?

Question 14 14. 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 15 15. A geneticist is studying a genetic condition. They determine that the causative gene for this particular condition is located on human chromosome 2. What can we conclude about the condition? Why?

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Question 16 16. 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 17 17. Which of the following genetic techniques are used in human genetics?

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. Which of the following statements about multifactorial traits is TRUE?

Question 20 20. Which of the following statements could NOT be used to describe a multifactorial trait?

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Question 21 21. 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 22 22.

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

Question 24 24. Which phenotype(s) do the red blood cells from a person with AB blood type exhibit?

TExMaT Master Science Teacher 8-12: Genetics & Heredity 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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