What is the genetic disorder in which an individual has an overall masculine development gynaecomastia and is sterile?

The correct option is C

Klinefelter’s syndrome

The correct option is C.

Explanation of the correct option:

1. Klinefelter's syndrome is a genetic condition characterized by an additional X chromosome -XXY on the sex chromosome.
2. Because of the additional X chromosome, estrogen secretion is high, resulting in sterility, but overall masculine development.

Explanation of the incorrect options:

Option A:

Down's syndrome is a genetic illness characterized by trisomy of the 21st chromosome; as a result, the newborn/child develops a variety of problems.

Option B:

1. Turner's syndrome affects girls who have a sex chromosome with fewer X chromosomes.
2. The female is infertile because she has one fewer chromosome.

Option D:

1. Edward syndrome is a genetic condition characterized by trisomy of the 18th chromosome.
2. The newborn/child suffers physical and mental problems as a result of trisomy.

Final answer: Klinefelter's syndrome is a hereditary condition characterized by an individual's overall masculine development, gynecomastia, and infertility.