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 see only red-eyed females present, but you see both red-eyed and white-eyed males present. The
genotypes of the parents were ____.



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


ANSWER: d

Biology & Microbiology

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