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Mitosis - PowerPoint PPT Presentation


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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
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Animated Mitosis Clip

Real Mitosis video clip

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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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