What is the risk of hemophilia for her children? II3 in the pedigree below has two brothers with hemophilia A, a bleeding disorder that is inherited as an X-linked recessive trait.
A. 1 in 4 for a son, close to zero for a daughter B. 1 in 2 both for sons and daughters C. 1 in 2 for a son and 1 in 4 for a daughter D. 1 in 2 for a son, close to zero for a daughter E. 1 in 4 both for sons and daughters
Isn't it 1 in 2 for boy because you only get 2 boys in the punnet square and 1/2 of them are affected. I didn't think you included boy and girl results? If so then I understand 1/4. Hopefully that makes sense.. very tired.