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Question: Answered & Verified by Expert
Which one of the following conditions indicates Klinefelter's syndrome?
BiologyPrinciples of Inheritance and VariationNEET
Options:
  • A 44 + XXY
  • B 44 + XO
  • C 44 + XY
  • D 44 + XX
Solution:
1643 Upvotes Verified Answer
The correct answer is: 44 + XXY
Sex determining mechanism in human is of XY type. Out of 23 pairs of chromosome present, 22 pairs are exactly same in male and females, these are called as autosomes. Two X chromosomes are present in the females, whereas the presence of an X and Y chromosome are determinants of male characteristics.

44 + XO - Turner's syndrome, 44 + XY - Normal human male, 44 + XX - Normal human female

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