Mitosis Click on the hyperlink above to watch a tutorial of the cell cycle - PowerPoint PPT Presentation

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Mitosis Click on the hyperlink above to watch a tutorial of the cell cycle

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  1. MitosisClick on the hyperlink above to watch a tutorial of the cell cycle

  2. Critical Check Points in the Cell Cycle

  3. Chromosome Duplication Kinetochore

  4. The Phases Prophase Interphase Prometaphase Metaphase Cytokinesis Telophase Anaphase

  5. Mitosis Tutorial Click on the hyperlink above - Watch the narration of mitosis - Complete the step through version of mitosis - Complete the quiz after the tutorial

  6. Interphase • period of cell growth and metabolic activity • DNA is duplicated, but exists as chromatin • organelles have been replicated • G1, S, and G2subphases

  7. Prophase • chromatin condenses and forms chromosomes • mitotic spindle (microtubules) forms from centrosomes • centrosomes contain centrioles in animal cells Prophase Interphase

  8. Prometaphase • nuclear envelope breaks down • spindle fibers attach to chromosomes at a structure called a kinetochore - protein structure that assembles the centromere • spindle fibers begin to move chromosomes

  9. Metaphase • chromosomes have been aligned in the middle of the cell (metaphase plate) • centromeres are lined up Metaphase

  10. Anaphase • sister chromatids of each chromosome are separated • spindle fibers pull the sister chromatids apart • some spindle fibers act to elongate the cell Anaphase

  11. Telophase • cell elongation continues • nuclear envelopes reform around each set of chromosomes • chromosomes uncoil • mitotic spindle disappears

  12. Cytokinesis • division of the cytoplasm • two genetically identical daughter cells are formed • resulting daughter cells are diploid

  13. Animal and Plant Cell Mitosis Animal Cell • have centrosomes and centrioleswhich generate the mitotic spindle • cell membrane pinches inward during cytokinesisdividing the two cells (cleavage furrow)

  14. Animal and Plant Cell Mitosis Plant Cell • only have centrosomes • cell plate forms during cytokinesis • vesicles carrying cell membrane and wall components are transported to the midline - vesicles fuse forming the new cell membrane and wall

  15. Cell Plate Formation