Two parents are phenotypically normal, but one of their four biological children has a typical autosomal recessive trait. The other three children are phenotypically normal. It is very likely that:
A. if the affected child eventually marries a phenotypically normal spouse, all of their children will have the trait.
B. the affected child is a boy.
C. the parents are both heterozygous for the trait.
D. the trait was expressed by one of the grandparents of the children.
E. the affected child is a girl.
Ans: C. the parents are both heterozygous for the trait.
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