ScholarMatic: Explanation & Answer
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1. You have found a new small eukaryotic mammal in the wilds of Columbia (Missouri). This mammal has three pairs of chromosomes: two pairs of autosomes (chromosome # 1 and chromosome # 2) and a pair of sex chromosomes (XX in the female and XY in the male).You identify six distinct genes (a,b,c,d,e, and f) in this mammal and want to find the location of those six genes on three sets of chromosomes.You start by performing a series of two-point test crosses. From that series of test crosses, you obtain the following genetic linkage data: 1) genes a and c are X-linked and 15 map units apart 2)genes a and b are not linked 3)genes b and d are 10 map units apart 4) genes d and f are both autosomal, but not linked to one another 5) genes e and f are both autosomal, but not linked to one anotherA. 1. Describe the test cross that you would have performed to test the genetic linkage of genes e and f (this is the test cross that would have yielded result # 5 above). [In other words, what are the genotypes of the two parents that you would have mated to obtain genetic linkage data about genes e and f ?]2. What are the progeny genotypes that you could have obtained from the cross you describe in Part A. 1. ?B. 1. From the genetic linkage data provided, locate as many of these six genes on the three pairs of chromosomes as you can, and draw as complete a set of genetic maps as possible. [ You should arbitrarily place gene d on autosomal chromosome # 1.]
ScholarMatic: Explanation & Answer
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