1. 1 1 Mitosis and the Cell Cycle Big Idea: Mitosis is the process in which the nucleus divides to form two new nuclei and two cells with identical DNA.

2. How do little elephants grow up to be BIG elephants?

4. Mitosis begins after fertilization 1 cell becomes 2 cells, becomes 4 cells…becomes TRILLIONS

5. Why do cells make more cells?

6. Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm Interphase Prophase Metaphase Anaphase Telophase & Cytokinesis

7. Chromosomes are copied (# doubles) Chromosomes appear as threadlike coils ( chromatin ) at the start, but each chromosome and its copy( sister chromosome) change to sister chromatids at end of this phase CELL MEMBRANE Nucleus Cytoplasm

8. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

9. Mitosis begins (cell begins to divide) Centrioles appear and begin to move to opposite end of the cell. Spindle fibers form between the centrioles. Centrioles Sister chromatids Spindle fibers

10. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Spindle fibers Centrioles

11. Chromatids (or pairs of chromosomes) attach to the spindle fibers. Centrioles Spindle fibers

12. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

13. Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. The separated chromatids are now called chromosomes. Centrioles Spindle fibers

14. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

15. A new nucleus forms around each identical groups of chromosomes at opposite sides of the cell and two new nuclei form. Chromosomes appear as chromatin (threads rather than rods). Mitosis ends. Nuclei Chromatin

16. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

17. Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

18. Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase

19. Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase

20. I I nterphase P P rophase M M etaphase A A naphase T T elophase C C ytokinesis IPMATC I Prefer Meatloaf At Tennis Camp

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22. 22 - Cell Division 22

23. http://www.cellsalive.com/mitosis.htm

24. D E A B C F

25. A B D E C F