In Figure 17.5a, none of the F2 females has white eyes. Why?
A. F2 females have two X chromosomes, and
in this cross all F2 females are homozygous
for the red-eye allele.
B. F2 females have two X chromosomes, and
in this cross they all have one X carrying a
red-eye allele and another X carrying a whiteeye
allele.
C. Females can never have white eyes
because this allele is recessive.
D. The allele for red eyes is dominant over
white eyes, and these F2 females are either
homozygous dominant (red-eye allele) or are
heterozygous.
E. Females always have red eyes because
this allele is dominant.
D
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