Question

A child has sickle-cell disease (ss) but neither parent is ill. What must be true of her parents genotypes?

A. the father is heterozygous; the mother is normal
B. both parents are heterozyhous carriers
C. one parent has two ecessive alleles
D. the mother is heterozygous; the father is normal

Answer 1

The answer would be B, because it would mean both parents passed the “s” down to their child from their sets of “Ss”.

Answer 2

I think the answer is B