A Recessive Allele on the X Chromosome Causes Color Deficiency

question 65

Multiple Choice

A recessive allele on the X chromosome causes color deficiency. A noncolor-deficient woman (whose father is color deficient) marries a color-deficient man. If they have a son, what is the chance that he will be color deficient?

• A) 75%
• B) 100%
• C) 25%
• D) 50%
• E) 0%

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