The number of sex chromosomes is normal in

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(D) In $Down's$ syndrome,the chromosomal abnormality is an autosomal aneuploidy,specifically $trisomy$ of chromosome $21$. The total number of chromos

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Down's syndrome

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(D) In $Down's$ syndrome,the chromosomal abnormality is an autosomal aneuploidy,specifically $trisomy$ of chromosome $21$. The total number of chromosomes is $47$ ($45 + XY$ or $45 + XX$). Since the sex chromosomes ($XX$ or $XY$) remain in their normal pair configuration,the number of sex chromosomes is normal. In contrast,$Turner's$ syndrome $(45, XO)$ has one sex chromosome,$Klinefelter's$ syndrome $(47, XXY)$ has three sex chromosomes,and $Super$ female $(47, XXX)$ has three sex chromosomes.

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