What is the most important
molecule that needs to be copied
before eukaryotic cell division?
Chromatin, Chromatids, and Chromosomes
Chromatin, Chromatids, and Chromosomes
http://www.youtube.com/watch?v=gbSIBhFwQ4s&feature=related
Chromatin, Chromatids, and Chromosomes
During Cell Division
• The chromatin coils up
into chromosomes.
Before cell division
• Chromatin is a mixture of
DNA and protein in the
nucleus.
• The DNA is copied
(replicated)
Chromatin, Chromatids, and Chromosomes
• Each chromosome has two
chromatids
– The chromatids are held together
by a centromere
– Each chromatid contains identical
DNA
– The chromatids will split apart
and end up in different cells
– When the chromatids split, each
chromatid will be considered a
chromosome