You are a genetic counselor, and a couple comes to you with concerns that if they have a child
together it could have hemophilia. Neither one of them has hemophilia, but the woman's biological
father did have an X-linked recessive form of hemophilia. Which of the following would be a correct
thing to tell them?
a. Any child that they produce will have a 50% chance of having hemophilia.
b. All of their male offspring will have hemophilia, and each of their female offspring will
have a 50% chance of having hemophilia.
c. None of their offspring should have hemophilia, but all of their female offspring will be
carriers for hemophilia.
d. Each of their male offspring will have a 50% chance of having hemophilia, and while their
female offspring should not have hemophilia, they will each have a 50% chance of being
carriers.
e. All of their male offspring will have hemophilia, and while their female offspring should
not have hemophilia, they will all be carriers.
D
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