Chapter%2012

Chapter%2012 - Chapter 12 Cell Division and the Cell Cycle...

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Chapter 12 Cell Division and the Cell Cycle
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100 µm 200 µm 20 µm (a) Reproduction (b) Growth and development (c) Tissue renewal (b) Cancer cells 25 µm Uses and Abuses of Cell Division
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Origin of replication Two copies of origin E. coli cell Bacterial chromosome Plasma membrane Cell wall Origin Origin Bacteria divide through a relatively simple process of binary fission , which means simply ‘splitting into two.’ Following duplication of the chromosome, the cell forms a new cell membrane and cell wall in the middle to create two genetically identical cells.
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20 µm Increased complexity of eukaryotic cells, including much more DNA, complicates replication and division
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0.5 µm Chromosomes Chromosome duplication (including DNA synthesis) Chromo- some arm Centromere Sister chromatids DNA molecules Separation of sister chromatids Centromere Sister chromatids Chromosome nomenclature
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S (DNA synthesis) MITOTIC (M) PHASE Mitosis Cytokinesis G 1 G 2 Cell division and DNA synthesis are confined to discrete stages of the cell cycle.
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2 of Interphase Centrosomes (with centriole pairs) Chromatin (duplicated) Nucleolus Nuclear envelope Plasma membrane Early mitotic spindle Aster Centromere Chromosome, consisting of two sister chromatids Prophase Prometaphase Fragments of nuclear envelope Nonkinetochore microtubules Kinetochore Kinetochore microtubule Metaphase Metaphase plate Spindle Centrosome at one spindle pole Anaphase Daughter chromosomes Telophase and Cytokinesis Cleavage furrow Nucleolus forming Nuclear
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This note was uploaded on 01/27/2011 for the course BIOL 112 taught by Professor Vaughn during the Fall '08 term at Texas A&M.

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Chapter%2012 - Chapter 12 Cell Division and the Cell Cycle...

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