In humans,mental retardation is associated wi | vedclass

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(A) Mental retardation in humans is often associated with sex chromosomal aneuploidy,such as $Klinefelter$ syndrome $(47, XXY)$ or $Turner$ syndrome $

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Gain of an $X$ chromosome

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(A) Mental retardation in humans is often associated with sex chromosomal aneuploidy,such as $Klinefelter$ syndrome $(47, XXY)$ or $Turner$ syndrome $(45, X)$.Specifically,the condition known as $Klinefelter$ syndrome,which involves the presence of an extra $X$ chromosome $(47, XXY)$,is frequently associated with varying degrees of mental retardation.Therefore,the gain of an $X$ chromosome is a common cause of such sex-linked abnormalities.

In humans,mental retardation is associated with sex-linked abnormalities. It is generally due to:

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