A Man Who Is a Dwarf with Achondroplasia and Normal

Multiple Choice

A man who is a dwarf with achondroplasia and normal vision marries a color-blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height. Dwarfism caused by achondroplasia is autosomal dominant, and red-green color blindness is X-linked recessive. What proportion of their sons would be color blind and of normal height?

A) none
B) half
C) one out of four
D) all