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Question

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

A
Down's syndrome
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B
Turner's syndrome
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C
Klinefelter's syndrome
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D
Edward's syndrome
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Solution

The correct option is C Klinefelter's syndrome
Klinefelter's syndrome is caused due to an additional copy of X-chromosome and hence the karyotype becomes 47, XXY. These individuals have overall masculine development but also show gynaecomastia (development of breasts). Such individuals are sterile.

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