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A person with the sex chromosomes XXY suffers from

1. Down's syndrome
2. Klinefelter's syndrome
3. Turner's syndrome
4. Gynandromorphism

Correct answer: Klinefelter's syndrome

Solution

XXY is the typical chromosomal pattern of Klinefelter's syndrome. It occurs in males with an extra X chromosome, unlike Down's syndrome (trisomy 21) or Turner's syndrome (XO).

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