Refer to the Following Information to Answer the Questions Below

question 32

Multiple Choice

Refer to the following information to answer the questions below.
A man who is an achondroplastic dwarf with normal vision marries a colour-blind woman of normal height. The man's father was 6 feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green colour blindness is X-linked recessive.
-What proportion of their sons would be colour-blind and of normal height?

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