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Question:

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

Turner's syndrome

Edward syndrome

Down's syndrome

Klinefelter's syndrome

Solution:

Correct option is Klinefelter's syndrome. Individuals with Klinefelter's syndrome have trisomy of sex chromosomes as 44+XXY (47). They show overall masculine development, gynaecomastia and are sterile. So the correct answer is "Klinefelter's syndrome".