Biology / Unit 4 Bio 0841 short lesson, about 20 seconds
Higher-Order Chromatin Packing
Captions available
The idea
Beyond the nucleosome, DNA coils into a 30-nanometer chromatin fiber, then into loops organized by fibrous proteins, reaching its most condensed state during mitosis.
In practice
Each chromosome occupies its own territory in the nucleus without overlapping neighbors, a spacing these packing levels help maintain.
Where people slip
Chromatin packing is dynamic — it loosens and tightens with gene needs and cell-cycle stage.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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