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Mitosis

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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Mitosis

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  1. Mitosis

  2. 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”

  3. 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 mitosis

  4. 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

  5. Prophase • 1st Mitosis Stage • Chromatin (DNA strands) coils into chromosomes • Nucleus dissolves spilling the chromosomes • Spindle fibers form

  6. Metaphase • 2nd stage of mitosis • Spindle fibers attach to centromeres of each chromosome • Spindle fibers pull the chromosomes to the cell’s equator

  7. Anaphase • 3rd stage of mitosis • Spindle fibers rip apart the chromosomes • 1 chromatid pulled each direction

  8. Start (interphase) Telophase • 4th stage of mitosis • Spindle fibers dissolve • Cytokinesis splits the cytoplasm • Nucleus reforms • Chromatids unwind into chromatin • End result: 2 identical diploid cells End (Telophase)

  9. Cytokinesis • Defined: Dividing of the cytoplasm • In animals: Cell pinches inward • In plants: Cell plate begins to separate the two new cells Cell plate

  10. Name that Stage! Metaphase Hint: Chromosomes are aligned in middle of cell

  11. Name that Stage! Telophase Hint: Cell plate is splitting the cell

  12. Name that Stage! Interphase Hint: Two normal looking nuclei of two cells

  13. Name that Stage! Prophase Hint: Chromosomes are forming and the nucleus is gone

  14. Name that Stage! Anaphase Hint: Chromatids are being pulled apart

  15. prophase c a b interphase d metaphase telophase e anaphase 45 seconds: Discuss with your neighbor. Name picture A, B, C, D, E.

  16. Mitosis A Quick Overview

  17. review • In order, name the 5 stages of the cell cycle. • Pick a stage of the cell cycle. Name two things that happen in this stage. • The division of the cytoplasm is called _____. • Which cells divide by mitosis? • During which interphase stage is DNA created? • During which stage do spindle fibers form? • During which stage are chromosomes aligned in the middle? • During which stage are chromatids separated? • During which stage does the nucleus dissolve?

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