If a woman is a carrier for the color-blind recessive allele and her husband has normal vision, what are their chances that a son will be color-blind?
A) none, because the father is normal
B) 50%, since the mother is only a carrier
C) 100%, because the mother has the gene
D) 25%, because the mother is a hybrid
E) None, since the son will also be just a carrier.
50%, since the mother is only a carrier.
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