E bacteria the genome is single circular dna molecule

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Unformatted text preview: cell division • In prokaryotic cells (i.e. bacteria), the genome is single circular DNA molecule, but in eukaryotic cells (i.e. us), the genome divided among multiple chromosomes housed in the nucleus — Humans have 46, chickens 78, rice 24 Eukaryotic chromosomes • Chromatin: DNA plus packaging proteins — DNA is wrapped around proteins • Chromatin barely visible when cell is not dividing - DNA loosely packed and accessible for cell • DNA condenses into visible chromosomes before cell division - Chromatid - one of 2 identical copies of a replicated chromosome - Sister chromatids - pair with identical DNA sequence • Most human cells have 46 chromosomes - 23 from each parent - Somatic or body cells - Diploid - 2 full sets of genetic information • Sperm and egg cells are haploid (one set) - 23 total chromosomes - Produce...
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This document was uploaded on 03/27/2014 for the course BIOLOGY Bio 2 at Timber Creek High.

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