An achondroplastic male dwarf with 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. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive.How many of their sons would be color-blind and of normal height?
A) all
B) none
C) half
D) one out of four
E) three out of four
Ans: C) half
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