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Mitosis
 

Mitosis

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    Mitosis Mitosis Presentation Transcript

    • Mitosis
    • Mitosis
      • Mitosis is a process of cell division
      • Goal = production of 2 daughter cells.
      • The daughter cells are identical to one another and to the original parent cell.
      • Cells divide for growth or repair.
      • Before each division, the cell makes an identical copy of each chromosome
      • During mitosis, each of the two new cells receives a complete set of 46 chromosomes.
      • Identical meaning it has the same info.
    • Stages
      • Interphase
      • Prophase
      • Promatophase
      • Metaphase
      • Anaphase
      • Telophase
    •  
    • Interphase
      • Preparing with mitosis
      • The cell is engaged in metabolic activity
      • Nucleolus may be visible.
      • The cell may contain a pair of centrioles
    • Prophase
      • Chromatin in the nucleus begins to condense and becomes visible
      • Each chromosome has duplicated
      • Consists of two sister chromatids.
      • The nucleolus/nuclear envelope disappears.
      • Centrioles begin moving to opposite ends of the cell and fibers extend from the centromeres.
      • Some fibers cross the cell to form the mitotic spindle.
    • Prometaphase
      • Proteins attach to the centromeres creating the kinetochores.
      • Microtubules attach at the kinetochores
      • Chromosomes begin moving.
    • Metaphase
      • Spindle fibers align the chromosomes along the middle of the cell nucleus (metaphase plate/equitorial).
      • This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome.
      • Held in place by microtubules attached to the mitotic spindle.  
    • Anaphase
      • The paired chromosomes separate at the kinetochores and move to opposite sides of the cell.
      • The centromeres divide.
      • Sister chromatids separate and move toward the corresponding poles.  
    • Telophase
      • Chromatids (daughter chromosomes) arrive at opposite poles of cell
      • New membranes form around the daughter nuclei.
      • The chromosomes disperse
      • No longer visible under the light microscope.
      • Microtubules disappear.
      • The condensed chromatin expands
      • Nuclear envelope reappears.
    • Cytokinesis
      • Results when a fiber ring composed of a protein called actin around the center of the cell contracts pinching the cell into two daughter cells, each with one nucleus.
    • Mitosis in general
    • Summary
    • Mitosis vs Meiosis