NEET Biology question
A woman who is a carrier of a certain disease marries a man who is normal for this trait. They have five children (2 daughters and 3 sons). All sons suffer from the given disease, but none of the daughters are affected. Which of the following could be this disease?
Answer: (B)
Solution
A disease transmitted from a phenotypically normal "carrier" mother specifically to sons, with daughters unaffected, is the classic signature of an X-linked recessive disease: each son has (independently, each pregnancy) a 50% chance of inheriting the mother's recessive allele and, being hemizygous, becoming affected,
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