1. Mitosis How one cell becomes two

2. What is the purpose of Mitosis ?

3. Hint: How do little elephants grow up to be BIG elephants ?

4. How doES That CUT ON YOUR FINGER HEAL ITSELF ?

5. Mitosis… Purpose: to make more cells Purpose: to make more cells Two new cells are produced—just like the original Two new cells are produced—just like the original For Growth, Repair, and Replacement

6. Parent to Daughter Cell: Same DNA

7. Stages of Mitosis Interphase

8. Most of a cells’ life is spent in Interphase

9. Interphase: “Inbetween” Phase between mitosis stages Phase between mitosis stages Time for cell growth and development Time for cell growth and development Chemical changes leading to cell division are taking place Chemical changes leading to cell division are taking place DNA replicates (copied) DNA replicates (copied)

10. Prophase: “Packaging” Chromosomes coil; become shorter and thicker (joined at centromere) Chromosomes coil; become shorter and thicker (joined at centromere) Nuclear membrane disappears Nuclear membrane disappears Centrioles form and move away from each other—protein spindle fibers form Centrioles form and move away from each other—protein spindle fibers form Protein fibers attach to centrioles Protein fibers attach to centrioles

11. Metaphase: “Middle” Chromosomes pair up and line up in the center (or middle) of the cell. Chromosomes pair up and line up in the center (or middle) of the cell. (Think: Metaphase = Middle) (Think: Metaphase = Middle)

12. Anaphase: “pull-Apart” Chromosomes separate — pull on the spindle fibers— and move toward opposite sides of the cell—to the opposite poles. Chromosomes separate — pull on the spindle fibers— and move toward opposite sides of the cell—to the opposite poles. (Think: Anaphase = Apart)

13. Telophase: “Two cells” New nuclear membranes form around the chromosomes. New nuclear membranes form around the chromosomes. Cytoplasm begins to divide—Cytokinesis. Cytoplasm begins to divide—Cytokinesis. Two new cells are formed. Two new cells are formed. Cell enters again into Interphase. Cell enters again into Interphase.

14. How can I possibly remember all of this?! I nterphase (in between) P rophase (packaging DNA) M etaphase (line up in middle of cell) A naphase (pull apart) T elophase I-P-M-A-T I-P-M-A-T Cytokinesis (two cells from one)