Euchromatin is the region of DNA that is relatively:
When the chromatin are viewed under electron microscope during interphase of the cell cycle, transcriptionally active chromatin stains less densely as it is more loosely packed. This chromatin is referred as euchromatin. Ref: Harper Illustrated Biochemistry, 26th Edition, Chapter 36, Page 316
Uncondensed
Condensed
Overcondensed
Paially condensed