You Are a Genetic Counselor, and a Couple Comes to You

Multiple Choice

You are a genetic counselor, and a couple comes to you with concerns that if they have a child together, he or she could have hemophilia. The man has an X-linked recessive form of hemophilia, but the woman does not. Genetic tests reveal the woman is not a carrier for hemophilia. How should you advise them?

A) Half of their children will have hemophilia.
B) All of their sons and half of their daughters will have hemophilia.
C) None of their children will have hemophilia, but all of their daughters will be carriers for hemophilia.
D) Each of their sons will have a 50% chance of having hemophilia, and each of their daughters will have a 50% chance of being carriers.
E) All of their sons will have hemophilia, and all of their daughters will be carriers.