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A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

1. Only daughters
2. Only sons
3. Both sons and daughters
4. Only grandchildren

Correct answer: Both sons and daughters

Solution

A woman gives one X chromosome to every child. Since both sons (XY) and daughters (XX) inherit an X from their mother, the affected X can be passed to either sex. The father determines whether the child is male or female, not the mother’s X transmission.

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