Heterochromatin is genetically and metabolically

Very active

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Inert

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Very active genetically

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Inert metabolically.

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Solution

The correct option is C Inert
Heterochromatin refers to certain regions of the chromosomes which contain darkly stained chromatin mass.
They appear as small and numerous bead-like structures over the chromosomes and are called chromomeres.
Heterochromatin has higher ribonucleic acid and less amount of DNA therefore, they are metabolically and genetically inert.
So, the correct answer is 'Inert'.

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