Biology, 18.09.2019 03:10 michaelandtammytrice
Sickle-cell trait is caused by a single defective allele, but sickle-cell disease only occurs in individuals that are homozygous for the sickle-cell allele. two people carry the trait but do not have sickle-cell disease. what is the probability that they will have two children with sickle-cell disease?
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