試題詳解

17. In tigers, a recessive allele of a particular gene causes both an absence of fur pigmentation (a white tiger) and a cross‐eyed condition. If two phenotypically normal tigers that are heterozygous at this locus are mated, what percentage of their offspring will be cross‐eyed?
(A)100%
(B)10%
(C)25%
(D)50%
(E)75%