Chromatin is a component of the nucleus. It consists of protein and DNA. There are two forms it namely the euchromatin and the heterochromatin. When it is stained and watched with the aid of a microscope, hetero chromatins are darkly colored bands while the euchromatin is the bands with light-colored. When the staining is darker, it means the DNA packaging is tighter.
Therefore DNA packaging is tighter in heterochromatin than in Euchromatin. Heterochromatin’s coiled regions are compact, while euchromatin coiled regions are loose. Heterochromatin has more DNA than euchromatins. Replication in Euchromatin is early, while the replication is heterochromatin is late.
Euchromatin is usually found in eukaryotes, cells having nuclei, and the prokaryotes, cells that do not have nuclei. Heterochromatin can only be found in the eukaryotes. The functions of the euchromatin and the heterochromatin include the transcription of DNA, expression of the gene, and gene repression.