An abnormal human male phenotype involving an extra $X$ chromosome $(XXY)$ is a case of

  • A
    Down's syndrome
  • B
    Intersex
  • C
    Edward syndrome
  • D
    Klinefelter syndrome

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In humans,which disorder is caused due to the absence of one of the $X$ chromosomes,i.e.,$45$ with $XO$?

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The person with Klinefelter's syndrome has which of the following chromosomal constitutions?

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Briefly explain Down's syndrome.

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