Class 12 NEET Biology Principles of Inheritance and Variation Questions Part 1

Klinefelter syndrome is a genetic condition that results when a boy is born with an extra copy of the X chromosome. Klinefelter syndrome may adversely affect testicular growth, resulting in smaller than normal testicles, which can lead to lower production of testosterone. The syndrome may also cause reduced muscle mass, reduced body and facial hair, and enlarged breast tissue.
So, the correct answer is 'Klinefelter's syndrome'.