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ExamsNEETBiology

In Down’s syndrome of a male child, the sex complement is

  1. XO
  2. XY
  3. XX
  4. XXY

Correct answer: XY

Solution

Down’s syndrome is caused by trisomy 21, an autosomal abnormality, so it does not alter the sex chromosome complement. A male with Down’s syndrome still has the usual XY sex complement.

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