Answer:
50%
Explanation:
He will have hemophilia if he inherits his mother's X chromosome with the hemophilia gene. He will have normal blood coagulation if he receives his mother's other X chromosome. So a carrier's son has a 50% risk of inheriting hemophilia. Each son has a 50% risk of having hemophilia. Each daughter has a 50% chance of inheriting the hemophilia gene. Each daughter has a 50% risk of having hemophilia.
