AP BIOLOGY

Detailed explanation-1: -The eye color gene is located on the X chromosome (one of the sex determining chromosomes of Drosophila). White eye color is recessive. When a red eyed male mates with white eyed females, their daughters will have red eyes, but their sons will have white eyes.

Detailed explanation-2: -In Drosophila, white eye colour is recessive X-linked trait while red eye colour is dominant. A white eyed female is crossed with red eyed male.

Detailed explanation-3: -Thus, the genotype of a white-eyed female would be Xw+Xw+ because white eye color is recessive and manifests itself when both the mutant alleles are present. The genotype of a red-eyed male would be XwY as it has wild eye color.

Detailed explanation-4: -A ratio of copulation success is 0.75 for white-eyed male to 1 for wild-type male26. Such a sexual discrimination against white-eyed males eventually results in the elimination of mutant allele from a laboratory population26.