Question

Hemophilia, a blood clotting disorder in humans, is due to an X-chromosome mutation. What will be the results of mating between a normal (non-carrier) female and a hemophiliac male?

(Hint: this is a sex-linked trait)

a
All daughters are normal, and all sons are carriers (heterozygous).
b
Half of sons are normal and half are hemophiliac; and all daughters are (heterozygous).
c
All sons are normal, and all daughters are carriers (heterozygous).
d
Half of daughters are normal and half of sons are hemophiliac.

Answer 1

d) Half of daughters are normal and half of sons are hemophiliac.