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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.
-How many of their daughters might be expected to be colour-blind dwarfs?
A)all
B)none
C)half
D)one out of four
E)three out of four

Question

Quizplus · Accepted Answer

The man is heterozygous for achondroplasia (Dd) and has normal vision (XY). The woman is homozygous recessive for height (dd) and is color-blind (XcXc). All daughters will inherit one Xc from the mother and one normal X from the father, so none will be color-blind. They will all inherit one D from the father, so they will all be dwarfs.

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