In a typical nucleus, some regions of chromatin are stained light and

1.	In a typical nucleus, some regions of chromatin are stained light and others dark. Explain why is it so and what is its significance ?
Answer» Light stained-loosely packed-Euchromatin. Dark stained-densely packed-Heterochromatin Euchromatin - transcriptionally active Heterochromatin - transcriptionally inactive Detailed answer: Euchromatin is lightly stained, diffused but narrow fibrous part of chromatin. It is normal chromatin which possesses active genes. It is transcriptionally active. During nuclear division it replicates normally. It is formed through loose spiralization of nucleosome strands. Heterochromatin is darkly stained granular part of chromatin and is formed by solenoid type of coiling of nucleosomes. Transcription does not occur in it. Active genes are absent in it.

In a typical nucleus, some regions of chromatin are stained light and others dark. Explain why is it so and what is its significance ?

Answer»

Light stained-loosely packed-Euchromatin.

Dark stained-densely packed-Heterochromatin

Euchromatin - transcriptionally active

Heterochromatin - transcriptionally inactive

Detailed answer:

Euchromatin is lightly stained, diffused but narrow fibrous part of chromatin. It is normal chromatin which possesses active genes. It is transcriptionally active. During nuclear division it replicates normally. It is formed through loose spiralization of nucleosome strands.

Heterochromatin is darkly stained granular part of chromatin and is formed by solenoid type of coiling of nucleosomes. Transcription does not occur in it. Active genes are absent in it.

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