A female Drosophila of unknown genotype was crossed with a white-eyed male fly, of genotype (w = white eye allele is recessive, w+= red-eye allele is dominant.) Half of the male and half of the female offspring were red-eyed, and half of the male and half of the female offspring were white-eyed. What was the genotype of the female fly?

A.

B.

C.

D.

E.

Female must be heterozygous because she can transmit either the red eye or white eye allele to her sons and daughters.