AP_Chapters_15-17

AP_Chapters_15-17 - AP/IB Biology II - Practice Test -...

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AP/IB Biology II - Practice Test - Chapters 15-17 Molecular Basis of Inheritance C. Wade 1/08 Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. When Thomas Hunt Morgan crossed his red-eyed F 1 generation flies to each other, the F 2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result? a. The involved gene was on the X chromosome. b. The involved gene was on the Y chromosome. c. The involved gene was on an autosome. d. Other male-specific factors influence eye color in flies. e. Other female-specific factors influence eye color in flies. ____ 2. New combinations of linked genes are due to which of the following? a. nondisjunction b. crossing over c. independent assortment d. mixing of sperm and egg e. both A and C ____ 3. What does a frequency of recombination of 50% indicate? a. The two genes likely are located on different chromosomes. b. All of the offspring have combinations of traits that match one of the two parents. c. The genes are located on sex chromosomes. d. Abnormal meiosis has occurred. e. Independent assortment is hindered. ____ 4. The reason that linked genes are inherited together is that a. they are located on the same chromosome. b. the number of genes in a cell is greater than the number of chromosomes. c. chromosomes are unbreakable. d. alleles are paired. e. genes align that way during metaphase I. ____ 5. What is the mechanism for the production of genetic recombinants? a. X inactivation b. methylation of cytosine c. crossing over and independent assortment d. nondisjunction e. deletions and duplications during meiosis ____ 6. The frequency of crossing over between any two linked genes is a. higher if they are recessive. b. different between males and females. c. determined by their relative dominance. d. the same as if they were not linked. e. proportional to the distance between them. ____ 7. Males are more often affected by sex-linked traits than females because a. males are hemizygous for the X chromosome. b. male hormones such as testosterone often exacerbate the effects of mutations on the X chromosome.
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c. female hormones such as estrogen often compensate for the effects of mutations on the X. d. X chromosomes in males generally have more mutations than X chromosomes in females. e. mutations on the Y chromosome often exacerbate the effects of X-linked mutations. ____ 8. In cats, black fur color is caused by an X-linked allele; the other allele at this locus causes orange color. The heterozygote is tortoiseshell. What kinds of offspring would you expect from the cross of a black female and an orange male? a.
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This note was uploaded on 06/07/2009 for the course BIO 5 taught by Professor Martins-green during the Spring '09 term at UC Riverside.

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AP_Chapters_15-17 - AP/IB Biology II - Practice Test -...

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