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Homework 6 - BICD 100 Spring 2008 Page 1 of 3 HOMEWORK...

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BICD 100 Page 1 of 3 S. Brody, ext. 42619 Spring 2008 4125 Muir Biology 1 HOMEWORK SET #6 (Covering lectures #17, 18, 19) Due Friday, May 16, 2008 ***PLEASE PUT YOUR NAME AND SECTION NUMBER IN INK OR TYPED ON TOP OF YOUR HOMEWORK SET*** 30 pts. total ( 14 pts ) 1. A wild-type male of Drosophila that is so heavily irradiated that new mutations occurred in the gametes is then crossed to a female that has missing bristles and nicked wing margins. Use "b" for missing bristles and "n" for nicked wings. The progeny consists of sons that have nicked wings and missing bristles and normal appearing daughters. One particular F 1 when crossed to her brothers produced the following progeny: females F 2 males F 2 missing bristles nicked wings 40 33 missing bristles normal wings 10 1 normal bristles nicked wings 10 9 normal bristles normal wings 40 _7 100 50 a) On what chromosome or chromosomes are the alleles for missing bristles and nicked wings carried? b) How do you explain the observed ratio of total females to total males in the F 2 ?
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