Condition of sex chromosomes in a male child of Down's syndrome will be

  • [AIPMT 1991]
  • A

    $XY$

  • B

    $XXY$

  • C

    $XX$

  • D

    $XO$

Similar Questions

In Drosophila melanogaster, $3$ pairs of autosomes and sex chromosomes of $XO$ type give rise to a normal male in appearance. In man, $22$ pairs of autosomes and $XO$ type of sex chromosomes form

Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?

  • [AIPMT 2008]

What is Down’s syndrome ? Give its symptoms and cause. Why is it that the chances of having a child with Down’s syndrome increases if the age of the mother exceeds forty years ?

Loss of a single chromosome produces a condition called.

Number of sex chromosomes is normal in