A) XX
B) XO
C) XY
D) XXY
Correct Answer: D
Solution :
Dr. HF Klinefelter in 1942. Described Klinefelters syndrome. It occurs in men due to an extra\[X\]chromosome thus, having genetic constitution\[XXY\]This is 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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