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Wi09 Homework 4

Wi09 Homework 4 - Genetics Homework#4 – Due in lecture...

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Unformatted text preview: Genetics Homework #4 – Due in lecture Wednesday, February 25 You must include your name, your Student ID, your TA’s name, and your section number at the top of your paper. You may type or write, as long as it is neat and legible. 1. The recessive mutations a, b, and c identify three autosomal genes in D. melanogaster. The following progeny were obtained from a testcross of females heterozygous for all three genes. abC 243 aBC 241 aBc 15 abc 10 ABc 235 Abc 226 AbC 12 ABC 18 What conclusions are possible concerning the linkage relationships of these three genes? Calculate any appropriate map distances. 2. A genetic map of a region with three linked genes, T, R, and J, is shown below. T ­­­­­­­­­­­­­­­­­­­30 cM­­­­­­­­­­­­­­­­­­­R ­­­­­­­­­10 cM­­­­­­­­­­­J Suppose that you cross a pure‐breeding strain TRJ with a pure‐breeding trj strain, and then testcross the F1 progeny. a. What percentage of the testcross progeny would you expect to be phenotypically Tr? b. What percentage of the testcross progeny do you expect to be phenotypically TRJ? Assume no interference in this region. c. Same question as part (b), but now assume that interference = 0.2. ...
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