IGNOU BBCCT 123 2026 - Differentiate between euchromatin and heterochromatin and ex

Question

Differentiate between euchromatin and heterochromatin and explain chromatin remodeling.

10 Feb 2026

Answer :

Word Count : 240

Euchromatin and heterochromatin represent two structurally and functionally distinct forms of chromatin that play crucial roles in gene expression and regulation. Euchromatin is loosely packed, less condensed, and transcriptionally active, allowing transcription factors and RNA polymerase easy access to DNA. It is typically rich in gene sequences, replicates early during the S phase, and is associated with histone modifications such as acetylation, which reduces histone–DNA interaction and promotes gene expression. Euchromatin is also more sensitive to DNase digestion, reflecting its open and accessible structure. In contrast, heterochromatin is highly

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