A Woman with Normal Blood Clotting Mates with a Man

Multiple Choice

A woman with normal blood clotting mates with a man who has hemophilia. Their first child is a boy who has hemophilia. Tests show that the father and son both have the same form of hemophilia, that it is X-linked, and that the boy has normal genetic inheritance. You can predict that if the couple has more children together, it is likely that ____.

A) all of the children will have hemophilia
B) half of the boys and none of the girls will have hemophilia
C) none of the other children should have hemophilia
D) all of the boys and half of the girls will have hemophilia
E) half of the boys and half of the girls will have hemophilia