Multiple choice

A Barr body is present in a male child. The syndrome most likely to occur is

  1. Klinefelter’s syndrome

  2. Down’s syndrome

  3. Turner's syndrome

  4. Edward’s syndrome

  5. Trisomy
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A Correct answer
Explanation

A normal female with XX chromosomes has one Barr body. A normal male (XY) has none. Abnormal males with three XXY (Klinefelters' syndrome) have one Barr body.

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