In Drosophila, the genes sr (stripe thorax) and e (ebony body) are located at 62 and 70 cM, respectively, from the left end of chromosome 3. A striped female homozygous for e+ was mated with an ebony male homozygous for sr+. All the offspring were phenotypically wild-type (gray body and unstriped).
(a) What kind of gametes will be produced by the F1 females, and in what proportions?
(b) What kind of gametes will be produced by the F1 males, and in what proportions?
(c) If the F1 females are mated with striped, ebony males, what offspring are expected, and in what proportions?
(d) If the F1 males and females are intercrossed, what offspring would you expect from this intercross, and in what proportions?