Class 12 · Molecular Basis of Inheritance

Euchromatin vs Heterochromatin — NEET Biology

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Non-histone Chromosomal (NHC) proteins. In a typical nucleus, some region of chromatin are loosely packed (and stains light) and are referred to as euchromatin. The chromatin that is more densely packed and stains dark are called as Heterochromatin. Euchromatin is said to be transcriptionally active chromatin, whereas heterochromatin is inactive.

NCERT Biology · Class 12 · Chapter 5 · Paragraph 23
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Assertion (A): Different regions of chromatin show different packing densities and staining properties. Reason (R): Euchromatin is densely packed and stains dark while heterochromatin is loosely packed and stains light.

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