Allosomic trisomy condition is seen in

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(B) Trisomy refers to the condition where an extra chromosome is present,represented as $2n+1$.Allosomes are the sex chromosomes.In Klinefelter's synd

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Klinefelter's syndrome

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(B) Trisomy refers to the condition where an extra chromosome is present,represented as $2n+1$.Allosomes are the sex chromosomes.In Klinefelter's syndrome,the individual has an extra $X$ chromosome,resulting in a genotype of $44 + XXY$ ($2n+1$ condition).Since the extra chromosome is a sex chromosome,it is an allosomic trisomy.Down's syndrome is an autosomal trisomy (trisomy of chromosome $21$),not allosomic.Turner's syndrome is a monosomy $(45, XO)$,not a trisomy.Therefore,the correct answer is Klinefelter's syndrome.

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