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Question

In Down's syndrome of a male child, the karyotype will show
  1. XO
  2. 45 + XY
  3. 45 + XX
  4. XXY


Solution

The correct option is B 45 + XY
Down's syndrome is trisomy of 21st pair of autosomes. Hence the karyotype will show 45 autosomes and XY for a male child.

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