Question

What is Euchromatin and Heterochromatin ?

Answer 1

The DNA in the nucleus exists in two forms that reflect the level of activity of the cell. ... Euchromatin is prevalent in cells that are active in the transcription of many of their genes while heterochromatin is most abundant in cells that are less active or not active.

Answer 2

Hey!

Euchromatin
The chromatin region that takes less stain at resting nucleus is called euchromatin. During cell division though that area remains coiled state, but in the resting nucleus the region becomes extended.
■it doesn carry active genes
■it appears as loose in the interphrase nucleus but during cell division, become compact taking more stain.
■the chromatin fibre in this state maybe 30Å-80Å in dimension.

Heterochromatin
The region of the chromatin thread that is more condensed and takes in more stain in the resting nucleus is known as heterochromatin.
■it doesn't carry active genes
■it remains in a coiled and compact state in the interphrase nucleus
■late replication of DNA occurs of this region

hope it helps...