1. It is darkly stained region of the chromatin (chromosome).
2. It is compactly coiled regions and with more DNA.
3. It is genetically inert as can not transcribe mRNA due to tight coiling.
4. It is late replacative.
1. It is lightly stained region.
2. It is loosely coiled region and with less DNA.
3. It is genetically active.
4. It is early replicative.
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