A gene on the Y chromosome causes a rare disease. A woman married to a man with the disease has three children. The first two are daughters without the disease. The third is a son. What is the probability that the son will have the gene?

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


Answer: D

Biology & Microbiology

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Which of the following is NOT one of the types of variation that occurs within individuals?

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