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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!

Page 1

Question 1 1. The locus is _____.

Question 2 2.

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

Question 4 4. Joe is in urgent need of a blood transfusion. His blood genotype is AA. Mike has an oo genotype, and Mary has a BB genotype. Who would be able to donate blood to Joe, and why?

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. 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 7 7. 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 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.

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. Sons who suffer from hemophilia received the hemophilia allele from their mother.

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

Question 10 10. 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?

Page 3

Question 11 11. A Punnett square is useful when determining phenotypic output, for all of the following reasons EXCEPT:

Question 12 12. How many phenotypes are typically produced by a dihybrid cross?

Question 13 13.

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 14 14. Skin cancer is a multifactorial trait. Which of the following is plausible?

Question 15 15.

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.

Page 4

Question 16 16. When two genes are located on the same chromosome, they are said to be _____.

Question 17 17. 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 18 18. All of the following statements are correct EXCEPT:

Question 19 19. Some people have blue eyes and some people have brown eyes. Which answer best explains why this is the case?

Question 20 20.

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).

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Question 21 21. Based on Mendel's pea plants, if P is an allele that codes for purple flowers and p is an allele that codes for white flowers, what can you say about a plant that has the alleles Pp?

Question 22 22. DNA is a polynucleotide molecule consisting of the following nucleotides:

Question 23 23. Chargaff Parity Rule 1 states that _____.

Question 24 24. Complementary base pairing in DNA assures that only one of the following base pairs exists in DNA. Select the correct base pair.

Question 25 25. Mendel's second law is also known as:

Page 6

Question 26 26.

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 27 27.

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 28 28. What type of organism has two copies of every gene?

Question 29 29. Which of the following is NOT an example of a homozygous genotype?

Question 30 30. The trait which is expressed in a heterozygous state is known as

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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