Question

Q.7.
Nucleolar organizer regions are
Primary constrictions
Secondary constrictions
Tertiary constrictions
Acentric.​

Answer 1

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Explanation:

Chromosomes that lack a centromere are said to be acentric and fail to segregate normally during division. Secondary and tertiary constrictions may also be identified. Secondary constrictions are associated with nucleoli and are called nucleolar organizer regions (NOR).

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