Question

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 O a. half of the boys and none of the girls will have hemophilia O b. all of the boys and half of the girls will have hemophilia O c. half of the boys and half of the girls will have hemophilia O d. none of the other children should have hemophilia O e. all of the children will have hemophilia

Answer 1

hemophilia shows the sex-linked inheritance, sons inherit the X chromosomes from mother, since the son is affected with X-linked hemophilia the mother is a carrier of the trait.

let the alleles be XH- normal Xh- hemophilia

XHXh * XhY

	XH	Xh
Xh	XHXh ( carrier female)	XhXh (hemophilic female)
Y	XHY ( normal male)	XhY ( hemophilic male)

here half of girls and half of boys have hemophilia.

so the answer is c) half of the girls and half of the boys will have hemophilia.