Two sister chromatids are attached with

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(B) The correct answer is $B$. Two sister chromatids are held together at a specific region called the centromere. The centromere is the primary const

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Centromere

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(B) The correct answer is $B$. Two sister chromatids are held together at a specific region called the centromere. The centromere is the primary constriction of the chromosome. During cell division,the kinetochore,a disc-shaped protein structure,is assembled on the surface of the centromere,which serves as the attachment site for spindle fibers.

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