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Cell Division
 

Cell Division

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    Cell Division Cell Division Presentation Transcript

    • Cell Division
      • Mitosis & Meiosis
    • Why cells divide?
      • Replace old, damaged or dead cells
      • Growth of organism (multicellular)
      • Reproduce new organisms
    • Prokaryotic Cell Division
      • Binary Fission:
      Cell Grows Chromosome copies Cell Splits Into Two
    • Eukaryotic Cell Division
      • 2 kinds of cell division
        • Mitosis- Process in which 2 new cells with identical genetic material are made from the parent cell (1 diploid cell divides to produce 2 new diploid cells)
        • Meiosis- Process in which gametes (sex cells) are made in which they recieve half of the genetic information
    • Cell Cycle
      • Repeating events of life of a cell
      • Three events:
        • Interphase: cell growing (not dividing)
        • Mitosis or Meiosis: Genetic material dividing
        • Cytokinesis: Division of cell itself
    • Cell Cycle
    • Interphase
      • G1 phase
        • cell grows to mature size
      • S phase
        • Cell’s DNA copies
      • G2 phase
        • Cell prepares for cell division
      • G0 phase- cell no longer divides (nerve cells)
    • Interphase
    • Mitosis Division of chromosomes
      • 4 Events
        • P rophase
        • M etaphase
        • A naphase
        • T elophase
    • Prophase
      • Chromatin (DNA) shortens and tightens into distinct rod-shaped chromosomes
      • Nucleus & nucleolus disappear
      • Two pairs of centrioles migrate to each pole of the cell and release spindle fibers that radiate throughout the cell and attach to the centromere of each chromosome
    • Metaphase
      • Each chromosome lines up at the equator of the cell
    • Anaphase
      • •  Chromatids of each chromosome split and are pulled apart to opposite poles of the cell
    • Telophase
      • Chromosomes become less coiled and return to the less tightly coiled chromatin
      • Nucleus and nucleolus reappear in each new cell
      • Spindle fibers disappear
    • Cytokinesis
      • Cell & cytoplasm divide either by cleavage furrow in animal cells or cell plate in plant cells