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Mitosis&Meiosis - Mitosis and Meiosis Mitosis Why...

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Mitosis and Meiosis
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Mitosis: Why do you need this process? OUCH
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Figure 17.7a Figure 17.7a
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Compacting of DNA
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Three Steps to Cell Division (The Cell Cycle) Interphase Mitosis Cytokinesis
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Cell Cycle 1.  G1 - growth of the cell 2.  S Phase - replication of DNA 3.  G2 - Final preparations for cell division 4.  M Phase - mitosis, actual separation of the  replicated chromosomes and division of  cellular components into two cells.
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The Cell Cycle and Mitosis Most of the time a cell is in interphase ,   performing its normal functions Figure 17.7b Figure 17.7b
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The Cell Cycle and Mitosis During G 1 (gap 1 or growth), most of the cell’s organelles duplicate and the cell grows larger. During the S (synthesis) stage, the chromosomal DNA replicates. During the G 2 (second gap) stage, proteins necessary for mitosis are synthesized.
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Control of the Cell Telomeres - special repeated sequence at the ends of the chromosome. Crowding Chemical signals
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Mitosis Mitosis is division of the cell nucleus. Sister chromatids are pulled apart and one copy of each ends up in the nuclei of the two daughter cells. Mitosis has four stages: prophase , metaphase , anaphase, and telophase .
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Homologous Chromosomes Paired Together
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Mitosis 1. During prophase , the replicated chromosomes condense (forming sister chromatids). Microtubules  (spindle fibers) form and grow, ultimately radiating out from the poles of the dividing cell, anchored by centrioles .
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