Given That Loci a and B in Drosophila Are Sex-Linked

question 6

Essay

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 × ab/Y male
b) AaBb (dominant alleles on homologs)female × ab/Y male
c) aabb female × AB/Y male (no crossing over in male Drosophila)

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