The .......... is a primary constriction.

Telomere

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Sarcomere

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Chromomere

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Centromere

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Solution

The correct option is D Centromere
The portion of the chromosome where the sister chromatids are connected is called as the centromere.
Hence a region of primary constriction. Each chromatid is thinner at the primary constriction than along the rest of its length in the chromosome.
Thus the correct answer is option D.

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