An X-Linked Recessive Gene (C)produces Red-Green Color Blindness

Multiple Choice

An X-linked recessive gene (c) produces red-green color blindness.A normal woman whose father was color blind marries a color-blind man.What are the chances that the first son will be color blind?  

A) 0%
B) 25%
C) 50%
D) 75%
E) 100%