HW 7 - Biology 202 NAME: Fall 2007 T.A.: Homework 7...

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Biology 202 NAME: Fall 2007 T.A.: Homework 7 Discussion Section #: Due: Monday, October 22, by 5pm – Turn in to T.A. mailbox 1. (2 pts) In chickens, a dominant sex-linked allele ( B ) produces barred feathers, and the recessive allele ( b ), when homozygous, produces nonbarred (solid color) feathers. Suppose a nonbarred male is crossed with a barred hen. a. 2 nonbarred females, 2 barred males 1:1 ratio b. If an F 1 female is mated with her father, what will be the appearance of the offspring? 2 nonbarred males, 2 nonbarred femaes 1:1 ratio c. If an F 1 male is mated with his mother, what will be the appearance of the offspring? Indicate phenotypes and ratios for all three questions. 2 barred males, 1 barred female, 1 nonbarred female 2:1:1 2. (2 pts) In humans, red-green color blindness is recessive and X-linked, whereas albinism is recessive and autosomal. What types of children (and in what percentages) can be produced as the result of marriages between two homozygous parents: a normal-
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HW 7 - Biology 202 NAME: Fall 2007 T.A.: Homework 7...

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