Interactive explorer
DNA packaging explorer
Zoom the eukaryotic packaging hierarchy while remembering chromatin is dynamic — not a single rigid cartoon fiber.
What this explorer teaches
Interactive zoom from DNA through histones, nucleosomes, chromatin, and condensed chromosomes.
Learning goal: Practice recognizing packaging levels and why “beads-on-a-string → rigid 30-nm fiber everywhere” oversimplifies living nuclei.
Interactive model
Educational model — simplified for learning. Not medical advice. Features are conceptual and not drawn to molecular scale unless stated.
DNA double helix
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Text-only walkthrough (same content as the interactive steps)
- DNA double helix
- Histone proteins
- Nucleosome
- Chromatin organization
- Condensed chromatin
- Mitotic chromosome
Guided steps (text)
- Step 1: DNA double helix
- Step 2: Histone proteins
- Step 3: Nucleosome
- Step 4: Chromatin organization
- Step 5: Condensed chromatin
- Step 6: Mitotic chromosome
How to use this explorer
- Advance with Next / Previous, the step chips, or keyboard ← →.
- On touch devices, tap chips and buttons (minimum comfortable target size).
- If you prefer reduced motion, the site respects
prefers-reduced-motionand jumps between states without animation. - Screen-reader / keyboard users: focus stays on controls; the live region announces the current step.
Scientific notes & limits
Living chromatin is dynamic: nucleosome arrays, loops, and domains change with cell type and activity. Older textbook cartoons that imply a universal rigid 30-nm fiber in every nucleus oversimplify modern observations. This explorer is a teaching hierarchy, not a claim that every genome folds the same way.
Related lessons
- DNA packaging — DNA packaging describes how long DNA molecules are folded with proteins to fit and function in cells.
- Nucleosome — The nucleosome is the basic repeating unit of chromatin: DNA wrapped around a histone octamer.
- Chromatin — Chromatin is the DNA–protein complex that packages eukaryotic genomes and helps regulate gene access.
- Chromosome — A chromosome is an organized package of DNA and proteins that carries genetic information.