Color Blindness Is Caused by an X-Linked Recessive Gene

Multiple Choice

Color blindness is caused by an X-linked recessive gene.A color-blind man and a woman with normal vision whose father was color blind have a son.The probability that their son is color blind is:

A) 0) 25 (or 25 percent) .
B) 0) 50 (or 50 percent) .
C) 0) 75 (or 75 percent) .
D) 1) 00 (or 100 percent) .
E) none of these.