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A Recessive Allele on the X Chromosome Is Responsible for Red-Green

Question 15

Multiple Choice

A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is color blind has children with a color-blind male. What is the probability that this couple's first son will be color blind?


A) 1/4
B) 1/2
C) 2/3
D) 3/4

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