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Number of Barr nodies in Klinefelter syndrome is
1. 1
2. 2
3. 3
4. Zero

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Correct Answer - Option 1 : 1

Concept-

  • The chromosomal disorders are caused due to absence or excess or abnormal arrangement of one or more chromosomes
  • The total number of chromosomes in a normal human cell is 46 (23 pairs).
  • Out of these 22 pairs are autosomes and one pair of chromosomes is a sex chromosome.
  • Down’s syndrome, Turner’s syndrome, Klinefelter’s syndrome are common examples of chromosomal disorders.

Explanation-

  • Klinefelter’s syndrome is caused due to the presence of an additional copy of the X-chromosome resulting in a karyotype of 47, XXY.
  • An inactive X chromosome in the cell which has more than one X chromosome is called a bar body.
  • Female(XX) have one Barr body.
  • Male(XY) have no Barr body.

Therefore Klinefelter's syndrome has 47, XXY means 1 Barr body.

  • Down's syndrome is caused due to the presence of an additional copy of chromosome number 21 (trisomy 21).
  • Turner's syndrome is caused due to the absence of one of the X chromosomes i.e., 45 with XO.

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