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UNIT II PRACTICE Exam-C

UNIT II PRACTICE Exam-C - UNIT II PRACTICE Exam-C BSC 2011...

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UNIT II PRACTICE Exam-C BSC 2011 Spring 2008 Select the best answer to each question - answers provided at the end. 1) What is a mechanism for the production of genetic recombination (i.e., a “reshuffling” of genetic information)? A) deletions and duplications during meiosis B) methylation of cytosine C) nondisjunction D) X inactivation E) crossing over and independent assortment 2) Males are more often affected by sex-linked traits than females because___________. 3) SRY is ________. 4) In cats, assume the same gender-determination system as in humans. Brown eye color is caused by an X-linked allele; the other allele for this gene causes blue-colored eyes. The heterozygote condition results in green eyes. What kinds of offspring would you expect from the cross of a brown-eyed female and a blue-eyed male? 5) A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is color-blind marries a color-blind male. What is the chance that a son of this couple will be color-blind? A) 0 B) 25% C) 75% D) 100% E) 50%
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