Reproduction of cells;Mitosis

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Reproduction of cells;Mitosis
2011-11-10 21:42:02
Reproduction cells

Reproduction of cells
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  1. Mitosis
    The stage of the cell cycle where the nucleus divides
  2. Interphase
    The stage of the cell cycle where the cell PREPARES to divide

    G1, S, G2,
  3. Mitosis: Prophase
    • A.chromatin condenses to into visible chromosomes
    • B. Mitotic Spindle form in cytoplasm between centriole pairs; lengthens as microtube grows.
  4. Mitosis: Prometaphase
    • A. Nuclear Envelope fragments
    • B. Mitotic Spindle invades Nucleus
    • C. Microtubules bind chromatids at kinetochores
  5. Mitosis: Metaphase
    • A. Centrosomes at opposite ends of cell
    • B. Chromosomes (attached to MT's) line up at metaphase plate (center of cell)
  6. Mitosis: Anaphase
    • Sister chromatids seperate and are pulled toward opposite poles.
    • Kinetochore MT's shorten at the ends
    • Motor proteins "walk" along MT's to pull chromatids
    • non - kintochore MT's get longer and slide past each other
  7. Mitosis: Telophase
    • A. Nuclear envelope reform (now two sepertare nuclei)
    • B. Chromosomes partly unfold
    • Cytokinesis (start during telophase)
  8. Cytokinesis
    Microfilaments under plasma membrane princh in; form cleavage fullow to squeeze cell in half
  9. Centromere
    Duplicated chromosomes has 2 sister chromotids attacted at the centromere
  10. Centriole
    Rectangular structures that are copied during the late part of interphase; pull on spindle fibers
  11. Chromatid
    Two of them make up a chromosome
  12. What is the longest phase in cell cycle?
    • Interphase, usually takes 18 hours
    • The M phase takes about 6 hours
    • It takes a cell one day to divide
  13. What's the longest phase in mitosis?
    The metaphase is the longest phase of mitosis