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Mitosis

Mitosis. Mitosis. Four main stages PMAT P rophase M etaphase A naphase T elophase. Prophase. 1 st stage of mitosis after Interphase Nucleolus disappears Nuclear envelope breaks down Chromatin condenses into chromosomes Chromosomes can be seen as “sister chromatids”

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Mitosis

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  1. Mitosis

  2. Mitosis • Four main stages • PMAT • Prophase • Metaphase • Anaphase • Telophase

  3. Prophase • 1st stage of mitosis after Interphase • Nucleolus disappears • Nuclear envelope breaks down • Chromatin condenses into chromosomes • Chromosomes can be seen as “sister chromatids” • Mitotic spindles form • Chromosomes attach to spindles

  4. Prophase

  5. Prophase DRAW IT

  6. Metaphase • Chromosomes gather in a plane across the middle of the cell • Meet Me in the Middle

  7. Metaphase DRAW IT

  8. Anaphase • “Sister” chromatids separate from each other • Chromatids move Away from each other towards opposite ends of the cell • Spindles attached to centrosomes get shorter • Spindles not attached get longer • Pushes poles of cell further apart

  9. Anaphase

  10. Anaphase DRAW IT

  11. Telophase • Centrosomes reach opposite poles • Spindles disappear • Nuclear envelope and Nucleolus reappear • Chromosomes uncoil and return to chromatin state

  12. Telophase

  13. Cytokinesis • Cytoplasm divides creating two new cells • Original “parent” cell no longer exists

  14. In plants, a cell plate forms from within the cell which eventually becomes part of the cell wall Cytokinesis • In animals, it appears as an indentation • Like a draw string around the cell is being tightened • Water balloon model

  15. Cytokinesis DRAW IT • For plant & animal

  16. Practice

  17. Interphase The cell has finished growing and replicating the DNA and is ready to divide.

  18. Prophase The Nuclear membrane breaks down and the chromosomes become distinct.

  19. Metaphase The chromosomes move to the center of the cell with the centromeres in a straight line.

  20. Anaphase The centromeres split and the chromatids move to opposite ends of the cell.

  21. Telophase The chromatids reach the ends of the cell.

  22. 3 2 1 4

  23. Put the following slides in order

  24. A

  25. B

  26. C

  27. D

  28. E

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