What are heterochromatin and euchromatin?

Heterochromatin:

1. Heterochromatin is a very tight and condensed form of chromatin.
2. Heterochromatin is very stable.
3. Heterochromatin is present in a very condensed form inside the nucleus that’s why it appears as small, darkly staining irregular particles inside the nucleus.

Euchromatin:

1. Euchromatin is a loosely packed form of chromatin.
2. That’s why DNA is more accessible.
3. This type of chromatin is involved in the active transcription of DNA into mRNA.