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Ch8.2Mitosis

Ch8.2Mitosis - Centrioles double in • animals Prophase...

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Mitosis & Cytokinesis Cell Growth and Reproduction Ch. 8.2
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Why do cells divide by Mitosis ? Growth &Repair Reproduction of single celled organisms under? conditions constant environment Amobea Reproducing
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Cells dividing by Mitosis……. Identical to original cell Same chromosome # Identical chromosome makeup Skin
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Cell Cycle 24 hours “G” or Growth 1 phase “S” or DNA Synthesis Growth 2 “M” or Mitosis phase / / /
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Where is DNA located ? 1. Nucleus 2. Chromosomes DNA
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Duplicated Chromosome (Late Interphase): Sister Chromatids Centromere
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Spindle & spindle fibers : Pull apart the sister chromatids Spindle fibers
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Cytokinesis :cell’s cytoplasm divides & splits apart
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Stages of Mitotic Cell Division Pro phase Meta phase Ana phase Tel ophase 1st” “middle” “apart” “far” or separate
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Interphase “Intermission” Normal metabolic activities Major state DNA= chromatin
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Late Interphase Prepares for mitosis DNA doubles= Sister chromatids
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Unformatted text preview: Centrioles double in • animals Prophase • Nuclear membrane disappears • Doubled DNA = condensed • “chromosomes” • Spindle fibers Metaphase • Chromoso mes line up mid- cell • Facing inward Anaphase • Chromosomes move to opposite poles at • Centrioles in • animals • Spindle apparatus in • plants Telophase • Cells divide • Cell plate or membranes form • Nucleus reappears Returns to Interphase • “Intermission” • Normal metabolic activities • Major state • DNA=chromatin Plant versus Animal Mitosis Plant: • Cell wall from • cell plate in telophase • Sindles Animal: • No cell wall • membrane cytokinesis • Centrioles Animal Telophase Interphase Plant Anaphase Interphase Cancerous cells ……. .. 1.Divide too many times 2.Divide into more than two cells! • Masses of cells = • “tumors” • benign • malignant...
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