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Homework 6 Key

Homework 6 Key - BICD 100 Spring 2008 30 pts total 1 a Page...

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BICD 100 Page 1 of 4 S. Brody, ext. 42619 Spring 2008 4125 Muir Biology HOMEWORK SET #6 — KEY 30 pts total 1. ( 14 pts total ) a) ( 2 pts ) Let b = bristles missing, n = nicked wings, the transmission is typical sex-linkage, thus P 1 generation: bn X++ (male) (female) bn Y F 1 bn and ++ Y bn b) ( 2 pts ) The 2:1 sex ratio in the F 2 suggests that the F 1 female received from her father an X chromosome bearing a recessive lethal. c) ( 5 pts ) The order of b , n and l (lethal) may be one of three possibilities: 1 2 3 + b n b + n b n + ________ _______ _______ l + + + l + + + l Double recombinants would be: 1 2 3 Genotype ++n lb+ bln +++ b++ +nl Phenotype nicked lethal lethal normal bristles lethal Observed 9 0 0 7 1 0 Since the rare class (i.e., the product of double exchange) is missing bristles , normal wing, then order 3 is indicated.
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BICD 100 Page 2 of 4 S. Brody, ext. 42619 Spring 2008 4125 Muir Biology d) ( 5 pts ) double single n-1 = 1 + 7 = 16 m.u. 50 b-n = 1 + 9 = 20 m.u. 50 b 20 n 16 l ___________________ 0.0 20.0 36.0
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