In Klinefelter syndrome . . . . . . .

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(B) Klinefelter syndrome is a genetic disorder caused by the presence of an extra $X$ chromosome in males.This results in a chromosomal constitution o

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Trisomy of $23^{	ext{rd}}$ pair of chromosome

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(B) Klinefelter syndrome is a genetic disorder caused by the presence of an extra $X$ chromosome in males.This results in a chromosomal constitution of $47, XXY$.Since the $23^{	ext{rd}}$ pair of chromosomes represents the sex chromosomes,the presence of an additional $X$ chromosome constitutes a trisomy of the $23^{	ext{rd}}$ pair.Therefore,the correct option is $B$.

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