An extra sex chromosome is present in . . . | vedclass

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(C) In $Klinefelter$ syndrome,the individual has an extra sex chromosome,resulting in a genotype of $47, XXY$. $Turner$ syndrome is characterized by t

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Klinefelter syndrome

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(C) In $Klinefelter$ syndrome,the individual has an extra sex chromosome,resulting in a genotype of $47, XXY$. $Turner$ syndrome is characterized by the loss of an $X$ chromosome $(45, XO)$. $Down$ syndrome is caused by an extra copy of chromosome $21$ (autosome),not a sex chromosome. $Thalassemia$ is an autosomal recessive blood disorder,not a chromosomal abnormality involving extra sex chromosomes. Therefore,the correct answer is $Klinefelter$ syndrome.

An extra sex chromosome is present in . . . . . . .

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