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In which genetic condition, each cell in the affected person, has three sex chromosomes XXY?

1. Turner’s syndrome
2. Thalassemia
3. Klinefelter’s syndrome
4. Phenylketonuria

Correct answer: Klinefelter’s syndrome

Solution

Klinefelter’s syndrome is the classic condition in which a person has an extra X chromosome, giving an XXY karyotype. Turner’s syndrome is XO, while thalassemia and phenylketonuria are inherited metabolic/blood disorders, not sex-chromosome abnormalities.

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