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 whiteeyed
males. The genotypes of the parents were ____.



a. Xw+Xw+; XwY
b. Xw+Xw; XwY
c. XwXw; Xw+Y
d. Xw+Xw; Xw+Y
e. XwXw; XwY


ANSWER: b

Biology & Microbiology

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