12EukCellDiv - Eukaryotic Cell Division cell cycle G1, S,...

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Eukaryotic Cell Division 1 chromatid 2 chromatids cell cycle anaphase meiosis I dynein meiosis II interphase sister chromatids crossing over chromosome telophase recombination chromatid cytokinesis synapsis mitosis asexual reproduction sexual reproduction prophase homologs heteroduplex DNA spindle fibers homologous chromosomes Holliday junction kinetochore diploid metaphase haploid 1) 2) 3) 4) 5) 6) 7) 8) Current Model for Homologous Recombination in Most Organisms Adapted from “Making crossovers during meiosis” by M.C. Whitby. Biochemical Society Transactions 33 (6) 1451-1455, 2005. 3’ 3’ 3’ 3’   S G 2 G 1 M R P H A S E E T N I DNA S ynthesis (replication) G ap 1 Growth, protein synthesis G ap 2 Growth, protein synthesis Nuclear      
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When we undergo cell division, it is to replace lost and dying cells. However we need to look at it in the context of the cell cycle. Cell division is an abbreviated M most of the time for mitosis. During interphase, it is when cells do what cells do. The 1 st stage after interphase is Gap 1, it is the longest period because the cell might not be ready to divide yet. Late in Gap 1, the cell will commit to replicating DNA and completing the cell cycle. After Gap 1 is S for synthesis, this is DNA replication. Gap 2 is for growth and protein synthesis and then M is when the cell actually divides. 1 chromosome – 1 double stranded DNA molecule; 1 chromatid 1 chromosome – consists of 2 double stranded DNA molecule, each strand is called a chromatid (2). In interphase, chromosomes are relatively decondensed and in prophase they are becoming condensed.
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This note was uploaded on 04/15/2008 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas at Austin.

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12EukCellDiv - Eukaryotic Cell Division cell cycle G1, S,...

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