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
- A45 chromosomes (44 + XO)
- B47 chromosomes (44 + XXY)
- C47 chromosomes (45 + XY)
- 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)