Their sons will all have normal color vision and brown eyes

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In humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision whose father was color blind marries a man who also has normal color vision. He has brown eyes but his mother had blue eyes. Which of the following do you expect to be true for their daughters?

A. Their sons will all have normal color vision and brown eyes. 

B. One-half of their sons will have normal color vision and brown eyes; 1/2 of their sons will have normal color vision and blue eyes.

C. Their sons will all have normal color vision and blue eyes.

D. One-half of their sons will be color blind and have blue eyes; 1/2 their sons will be color blind and have brown eyes.

Hemophilia is caused by several genetic factors; one, a recessive allele of an X-linked gene, is the subject of this problem. Assume that a man with hemophilia marries a normal woman whose father had hemophilia. What is the probability that their first son will have hemophilia?

A. 3/4
B. 1/2
C. 1/8
D. 1/16

Reference no: EM132526507

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