Find out the correct pair.

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Question

(B) $1$. Klinefelter's syndrome is characterized by the presence of an additional copy of the $X$ chromosome $(47, XXY)$,so option $A$ is incorrect.$2

Vedclass · Accepted Answer

Turner's syndrome - one $X$ sex chromosome present.

Vedclass · Answer

(B) $1$. Klinefelter's syndrome is characterized by the presence of an additional copy of the $X$ chromosome $(47, XXY)$,so option $A$ is incorrect.$2$. Turner's syndrome is caused by the absence of one $X$ chromosome,resulting in a $45, X0$ genotype,meaning only one $X$ sex chromosome is present. Thus,option $B$ is correct.$3$. Down's syndrome is caused by trisomy of the $21^{st}$ chromosome,not monosomy. Thus,option $C$ is incorrect.$4$. Beta thalassemia is caused by mutations in the $HBB$ gene located on chromosome $11$,not the $5^{th}$ pair. Thus,option $D$ is incorrect.

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