A nurse counsels a couple on sex-linked disorders. Both the man and the woman are carriers of the disorder. They ask the nurse how this disorder will affect any children they might have. What is the nurse's best response?
1. "If you have a daughter, she will not be affected."
2. "Your son will be affected because the father has the disorder."
3. "There is a 25% chance that your son will have the disorder because the mother has the disorder."
4. "There is a 50% chance that your son will be a carrier only."
4
Explanation: 4. There is a 50% chance that a carrier mother will pass the normal gene to each of her sons, who will be unaffected.
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