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Question
Given that loci A and B in Drosophila are sex-linked and 20 map units apart, what phenotypic frequencies would you expect in male and female offspring resulting from the following crosses? (Assume that A and B are dominant to a and b, respectively.)a) AaBb (dominant alleles on same chromosome) female x ab/Y male
b) AaBb (dominant alleles on homologs) female x ab/Y male
c) aabb female x AB/Y male (no crossing over in male Drosophila)
Answer
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