Science Homework Help

In Drosophila, the grape eye color is produced by an autosomal gene (Grape, G), which is dominant to the wild-type red eye color. Another sex-linked recessive gene (white, w) produces the white eye color. The effect of the Grape gene is epistatic to all other eye colors. In a cross between a pure breeding Grape female to a pure breeding white male (all other genes are homozygous wild type).

A. What are the phenotypes of the F1 males and F1 females?

F1 male phenotype [1]

F1 female phenotype [2]

B. In a F1 X F1 intercross, 800 progenies were produced. How many progenies do you expect to see in each of the following phenotypes?

Grape eyed male [3]

Grape eyed female [4]

Red eyed male [5]

Red eyed female [6]

White eyed male [7]

White eyed female [8]