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action_center_5 _f11 - Practice Problems Genetics Action...

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Practice Problems Genetics Action Center 9/27/11, 9/29/11 1. In the pedigree on the right, the vertical lines stand for protan colorblindness, and the horizontal lines stand for deutan colorblindness. These are two separate conditions that cause misperception of color; they are mutations at two different gene loci. a) Does the pedigree show any evidence that the genes are linked? b) If there is linkage, does the pedigree show any evidence for a genetic exchange between the two loci? If there is recombination, can an accurate distance between the genes be estimated? 2. Examine the following data set: Phenotype Number of Progeny virescent 200 purple 237 brown 82 virescent, brown 230 virescent, purple 79 purple, brown 195 wild type 42 virescent, purple, brown 44 Perform a statistical test to evaluate whether the purple and brown gene loci are linked. 3. A trihybrid produces the following gametes out of 1000 total: IBd 219 Ibd 212 IBD 32 IbD 31 ibD 215 iBD 224 ibd 29 iBd 38 Determine and thoroughly discuss the linkage relationships of these three loci.
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