Color blindness is caused by an X-linked recessive gene. A color-blind man and a woman with normal vision whose father was color blind have a son. The probability that their son is color blind is:

A) 1.00 (or 100 percent).
B) 0.75 (or 75 percent).
C) 0.50 (or 50 percent).
D) 0.25 (or 25 percent).
E) none of these.


Answer: C

Biology & Microbiology

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