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Solution


Q.

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile       [2019]
1 Down’s syndrome  
2 Turner’s syndrome  
3 Klinefelter’s syndrome  
4 Edward syndrome  

Ans.

(3)

Klinefelter’s syndrome occurs by the union of an abnormal XX egg and a normal Y sperm or a normal X egg and abnormal XY sperm. The individual has 47 chromosomes (44 + XXY). Such persons are sterile males with undeveloped testes, mental retardation, sparse body hair, long limbs and with some female characteristics such as enlarged breast, i.e., gynaecomastia.