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(D) Every chromosome essentially possesses a primary constriction,which is also known as the centromere. This region is essential for the attachment o

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Both $(2)$ and $(3)$

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(D) Every chromosome essentially possesses a primary constriction,which is also known as the centromere. This region is essential for the attachment of spindle fibers during cell division. While some chromosomes may also have a secondary constriction,the primary constriction (centromere) is a universal feature of all chromosomes. Therefore,both options $(2)$ and $(3)$ refer to the same structure.

Every chromosome essentially has $:-$

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