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14 May, 08:05

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

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Answers (2)
  1. 14 May, 08:59
    0
    The answer would be B, because it would mean both parents passed the "s" down to their child from their sets of "Ss".
  2. 14 May, 10:07
    0
    I think the answer is B
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