Heterochromatin remains condensed in which of the following part of chromosome?

Secondary constriction I

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Secondary constriction II

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Telomeres

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Both A and B

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Solution

The correct option is B Secondary constriction I
During the interphase stage, the chromatin present in chromosomes is classified as either euchromatin or heterochromatin, depending on the level of compaction. Euchromatin is a less compact structure representing a DNA, the Heterochromatin is more compact, composed of a nucleosome array in the secondary constriction I.
Thus, the correct answer is option A.

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