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NEET2026BiologyChapterActual

A sterile individual presents with overall masculine development along with the expression of feminine features such as gynaecomastia. The karyotype analysis of this patient will reveal:

Options

  1. A45 chromosomes (44 + XO)
  2. B47 chromosomes (44 + XXY)
  3. C47 chromosomes (45 + XY)
  4. D46 chromosomes (44 + XY)

Correct answer

B. 47 chromosomes (44 + XXY)

Step-by-step solution

The symptoms described, such as overall masculine development accompanied by feminine features like gynaecomastia (development of breasts) and sterility, are characteristic of Klinefelter syndrome. Klinefelter syndrome is a chromosomal disorder caused by the presence of an additional X chromosome in a male. The karyotype of such an individual is 47, XXY, which consists of 44 autosomes and XXY sex chromosomes. Answer: 47 chromosomes (44 + XXY)

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