Question

In Drosophila melanogaster, the gene for eye color is located on the X chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find both red-eyed females and white-eyed females as well as both red-eyed males and white-eyed males. The genotypes of the parents were ____.

Answer 1

Answer:

Female - Xw+Xw

Male - Y Xw+

Explanation:

Given

Allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw).

Offspring produced in a cross are

A) red-eyed females - Xw+Xw+

B) white-eyed females - XwXw

C) red-eyed males - YXw+

D) white-eyed males- YXw

Thus genotype of parents is

Female - Xw+Xw

Male - Y Xw+