Heredity and Evolution 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. A scientist has observed animals in a particular habitat for some time. She notices that in a population of birds those with either short or long beaks can find more food than those with average sized beaks. Over time, she notices a higher proportion of birds in the population have either short or long beaks. She is observing:

Question 2 2. Two animals heterozygous at gene A are mated. What ratio of genotypes will be produced in the offspring?

Question 3 3.

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 4 4. A criss-cross inheritance pattern is seen in what type of genetic inheritance?

Question 5 5. A couple has three children: a 14-year-old daughter and two sons, ages 10 and 12. If the mother and daughter are both known to have a genetic disorder, what would the pedigree of this family look like?

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Question 6 6. Which of the following statements about the proband is TRUE?

Question 7 7. What is the most likely type of inheritance for the genetic condition shown in this pedigree?

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. If this is a pedigree for a family with a history of hemophilia, which is a sex-linked condition, what do we know about the proband's mother?

Question 10 10. All of the following statements about the triangle symbol are true EXCEPT:

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

Question 14 14. Which of the following forces is LEAST likely to cause a new species to arise in a population?

Question 15 15.

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.

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Question 16 16. In the following pedigree, how many male cousins does the proband have?

Question 17 17. A new mutation allows a cheetah to run faster and hunt down more prey than its slower counterparts. This mutation increased the _____ of the cheetah.

Question 18 18.

Which of the following is an example of natural selection?

I. Albino animals are rare in nature because they are easy for predators to find.

II. The fastest gazelle is least likely to be eaten by a lion.

III. The gorilla that is strong enough to become alpha male is the most likely to pass on his genes.

Question 19 19. 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 20 20. 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?

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Question 21 21. Generally speaking, what are the odds that an autosomal dominant condition will be passed from an affected individual to their child?

Question 22 22. A scientist notices several birds in the same area that are similar in appearance with the exception of different beak lengths. She observes that one type of bird with a particularly long beak can pick bugs out of holes in the ground, while the birds with shorter beaks cannot. The longer beak is an example of

Question 23 23.

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

Question 25 25.

Which of the following is an example of a homologous structure or trait?

I. Arm bones of a human and wings of a bird

II. Wing of a penguin and wing of a mosquito

III. Beak of a penguin and beak of a duck

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Question 26 26. Some studies have shown that a single copy of the cystic fibrosis disease allele can confer resistance to tuberculosis to a person. This is an example of:

Question 27 27. 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 28 28.

Which of the following is an example of analogous structures or traits?

I. Leg bones of a human and leg bones of a penguin

II. Wing of a penguin and wing of a mosquito

III. Beak of a penguin and beak of a duck

Question 29 29. Which of the following statements does NOT help explain Mendel's law of segregation?

Question 30 30.

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

Heredity and Evolution 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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