Presentation on theme: "The length of DNA in one chromosome"— Presentation transcript:
1 The length of DNA in one chromosome The packaging of DNA in eukaryotic chromosomes or how you change this...The length of DNA in one chromosome4 cminto this...Too small to show the real size, but you could fit 10,000 along the length of a fingernail!0.2-2 µm
2 Link to 3D animation of the packaging of DNA into chromosomes
3 Level 1: Nucleosomes or ‘beads on a string’ Linker DNAHistone proteins form a complex
4 Level 2: Chromatin fibre Nucleosomes coil and stack
5 Level 3: Looped fibresChromatin fibre loops along the protein scaffoldProtein scaffold
6 Level 4: More folds to make the most compacted chromosome Looped chromatin fibre foldsThe most condensed form of DNA packaging during metaphase. Replication has just occurred so the image shows two chromatids0.2-2 µm
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