A) \[XX\]
B) \[XO\]
C) \[XY\]
D) \[XXY\]
Correct Answer: D
Solution :
Dr. H.F. Klinefelter in 1942 described this syndrome. It occurs in men due to an extra X? chromosome thus having genetic constitution ?XXY?. This is also trisomy but of sex chromosome or allosome. It usually results from non-disjunction and is expressed by small penis, absence of body hairs, gynaecomastia etc.
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