A woman with apparently normal health (mother) and a colorblind man (father) had a son with hemophilia and a normal daughter. If the genes for both traits are on the X chromosome, which statement about this family is true?
A. The maternal grandfather is colorblind.
B. The daughter cannot be a carrier for colorblindness.
C. The maternal grandfather is not hemophilic.
D. There is a 50% chance that the maternal grandfather is hemophilic.
E. The father is a carrier of hemophilia.
D
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