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

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Turner's Syndrome

Thalassemia

Phenylketonuria

Klinefelter's Syndrome

answer is B.

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Detailed Solution

Klinefelter syndrome is caused due to the presence of an additional copy of X chromosome resulting into a karyotype of 47, XXY.

The karyotype of a woman exhibiting Turner syndrome is 45, X0.

Thalassemia and phenylketonuria are mendelian disorders but not chromosomal disorders.

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