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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

Question

Quizplus · Accepted Answer

Since the man is an achondroplastic dwarf (Aa) and the woman is of normal height (aa), their sons have a 50% chance of being of normal height (aa). The woman is color-blind (XcXc), and the man has normal vision (XY), so all sons will inherit the Xc from their mother, making them color-blind. Therefore, half of the sons will be color-blind and of normal height.

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