PS_10 - NAME: TA: Problem Set 10 Chromosomal Variation...

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NAME: TA: Problem Set 10 Chromosomal Variation & Organelle DNA ECOL/MCB 320:Genetics, Spr 2008 1. A Drosophila geneticists has obtained females that carry attached-X chromosomes (i.e. the two X chromosomes have fused together) homozygous for a recessive mutation (y) that causes the body to be yellow instead of gray. She conducts two experiments. For each, predict the phenotypes of the progeny from these two crosses, the relative proportion of each of these phenotypes, and indicate which, if any, will be sterile. (Hint: You will need to refer back to concepts learned earlier in the class.) a. Experiment 1: She crosses some of the attached-X chromosome females to ordinary wild-type males. b. Experiment 2: She crosses the attached-X chromosome females to wild-type males that have compound XY chromosome (their X and Y chromosomes attached to each other). 2. Wild-type Arabidopsis has 5 chromosomes (2n = 10). Trisomic plants are designated as “Tr” followed by the trisomic chromosome number—that is, Tr1 is trisomic for chromosome 1. Assuming that
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PS_10 - NAME: TA: Problem Set 10 Chromosomal Variation...

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