Mitosis
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Mitosis. What is Mitosis?. Mitosis : Cell division involving somatic (non-sex) cells Involves only diploid cells Form of asexual reproduction for some life (bacteria & protista, fungi) End Result : Two genetically identical “daughter cells”. The Cell Cycle.

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Presentation Transcript

What is mitosis
What is Mitosis?

  • Mitosis: Cell division involving somatic (non-sex) cells

  • Involves only diploid cells

  • Form of asexual reproduction for some life (bacteria & protista, fungi)

  • End Result: Two genetically identical “daughter cells”


The cell cycle
The Cell Cycle

  • Defined: Repeating set of events in the life of a cell

  • 1) Interphase

    • G1, S, G2

  • 2) Prophase

  • 3) Metaphase

  • 4) Anaphase

  • 5) Telophase


  • Interphase
    Interphase

    • Divided into 3 Stages:

    • G1 Stage

      • Normal function performed

      • Cell growth

      • Organelles created

    • S Stage

      • Chromatin (DNA strands) duplicated

    • G2 Stage

      • Cell growth

      • Normal function performed


    Prophase
    Prophase

    • 1st Mitosis Stage

    • Chromatin (DNA strands) coils into chromosomes

    • Nucleus dissolves spilling the chromosomes

    • Spindle fibers form


    Metaphase
    Metaphase

    • 2nd stage of mitosis

    • Spindle fibers attach to centromeres of each chromosome

    • Spindle fibers pull the chromosomes to the cell’s equator


    Anaphase
    Anaphase

    • 3rd stage of mitosis

    • Spindle fibers pull ½ the chromatids to each end of the cell

      • Humans: 46 chromatids each way


    Telophase
    Telophase

    • 4th stage of mitosis

    • Spindle fibers dissolve

    • Chromatids unwind into chromatin

    • Nucleus reforms

    • Cytokinesis: division of the cytoplasm



    Animated Mitosis Clip

    Real Mitosis video clip


    Name that stage
    Name that Stage!

    Metaphase


    Name that stage1
    Name that Stage!

    Telophase


    Name that stage2
    Name that Stage!

    Interphase




    Prophase

    Metaphase

    Interphase

    Telophase

    Anaphase


    Quick review
    Quick Review

    • Mitosis = the division of somatic (non-sex) cells

    • Each stage has different characteristics

    • End Result = Two identical diploid cells


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