Another cross in Drosophila involved the recessive, X-linked genes yellow (y), white (w),...

Another cross in Drosophila involved the recessive, X-linked genes yellow (y), white (w), and cut (ct). A yellow-bodied, white-eyed female with normal wings was crossed to a male whose eyes and body were normal but whose wings were cut. The F1 females were wild type for all three traits, while the F1 males expressed the yellow-body and white-eye traits. The cross was carried to an F2 progeny, and only male offspring were tallied. On the basis of the data shown here, a genetic map was constructed.

(a) Diagram the genotypes of the F1 parents.

(b) Construct a map, assuming that white is at locus 1.5 on the X chromosome.

(c) Were any double-crossover offspring expected?

(d) Could the F2 female offspring be used to construct the map? Why or why not?