A woman is a carrier of an X-linked recessive disease and her partner is healthy. What is the probability that their son is affected?
Answer and explanation
Correct answer: C. 50 percent
- Step 1: A son receives his X chromosome from his mother. Step 2. She passes the affected X in half of cases. Answer: 50 percent. Why not the others: 25 percent is the chance for any child, and a father cannot pass an X to a son.
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