In fruit flies, one eye color gene is X-linked. What results are expected from reciprocal cross?

The full question sounds like this:





In fruit flies (Drosophila), one eye color gene is X-linked, with a recessive white allele and a dominant red allele. If white-eyed female flies are bred to red-eyed male flies, describe the expected offspring (assume all parental flies are true-breeding). What results do you expect if you do the reciprocal cross (where the male is red eyed and the female is white eyed)?





I do know how to answer the first part, but what about the reciprocal cross?

In fruit flies, one eye color gene is X-linked. What results are expected from reciprocal cross?
Just do the Punnett squares:





White-eyed female, red-eyed male:


. . . . Xw . . . Xw


Xr . . XwXr . XwXr


Y . . XwY . . XwY


All females are red-eyed, and all males are white-eyed.





Red-eyed female, white-eyed male:


. . . . . Xr . . . Xr


Xw . XwXr . XwXr


Y . . XrY. . . XrY


All offspring have red eyes.
Reply:Given that both parent are true-breeding





Red eyed male x White eyed female -%26gt; all females are red eyed, all males are white eyed.





White eyed male x Red eyed female-%26gt; all are red eyed.