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Answer: (a) primary constriction

The centromere is the narrow, constricted region of a chromosome where the two sister chromatids remain joined and where the kinetochore develops. Because it is the main constriction of the chromosome it is called the primary constriction. A secondary constriction (often the nucleolar organiser region) may occur elsewhere and can cut off a satellite; telomeres are the chromosome ends.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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