More than Just Lines on a Map: Best Practices for U.S Bike Routes
Cell cycle(mitosis) for edexcel made easy .pptx
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6. Section 10.2
Chromosomes
1. Chromosomes:
o “colored body”
o seen only when the cell divides
o contain genetic info in the form of
DNA
o are coiled chromatin
2. Composition of Chromatin
o Make up chromosomes
o Composed of DNA and protein called
histones (helps to condense the
DNA)
o DNA in a chromosome is 10,000x
longer than the chromosome itself
o Nucleosome: DNA coiled around
histones (“ball with string”)
o Nucleosomes coil into supercoils –
then into chromosomes
o Must condense in order to separate
correctly during mitosis
