probset13 - Problem Set 13, 2010 8 points total Name: 1....

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Problem Set 13, 2010 Name: 8 points total 1. What phenotypes do you expect to result from mutations in the following genes? A. in C. elegans : if X:A=0.5 if X:A=1.0 fem-3 xol-1 sdc-2 B. in Drosophila : tra dsx 2. You identified a mutation in the Drosophila gender identity crisis (gic) gene. You find the following results in genetic crosses: gic-/gic- female X gic-/gic- male 99.9% female A. Give two plausible explanations for this result. B. How would you distinguish between these two possibilities? 1
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Picture 74 Picture 75 Problem Set 13, 2010 Name: 8 points total 3. What phenoytpes do you expect to result from mutations in the following genes? A. In C. elegans : if X:A=0.5 if X:A=1.0 fem-2 her-1 tra-1 B. S. jonesii are found in two general moods, either happy or cranky. Surprisingly you find that mood in S. jonesii is under the control of a simple genetic pathway. Careful genetic analysis has defined the genes involved in control of disposition. The pathway is shown below. Arrows and bars indicated positive and negative
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probset13 - Problem Set 13, 2010 8 points total Name: 1....

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