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What are euchromatin and heterochromatin

What are euchromatin and heterochromatin?

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Chromatin is non condensed nuclear DNA, the usual DNA morphology in interphase (that is, the stage of the cell cycle in which the cells is not dividing itself). In this stage of the cell cycle chromatin can be found as heterochromatin, much condensed and dark (in electronic microscopy) parts of DNA molecules, and as euchromatin, less condensed and lighter parts of DNA molecules. As it is uncondensed euchromatin is the biologically active part of the DNA, that is, the region which has active genes to be transcript into RNA. The heterochromatin symbolizes the inactive parts of the DNA molecule.

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