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Eukaryotic Chromosomal Structure and Compaction
Levels of DNA Compaction
Double-stranded DNA wraps around histone proteins to form nucleosomes that have the appearance of "beads on a string." The nucleosomes are coiled into a 30-nm chromatin fiber. When a cell undergoes mitosis, the chromosomes condense even further.
Source
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"OpenStax College, Cell Division October 16, 2013."
http://cnx.org/content/m44459/latest/Figure_10_01_03.jpg
OpenStax CNX
CC BY 3.0.