1. Mitosis

2. 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
Remember: The cell won’t continue on to the next stage unless the cell is large enough and everything has been copied properly.

3. What is Mitosis?
Mitosis: Cell division involving somatic (non-sex) cells
Involves only diploid cells 2n
Form of asexual reproduction for some life (bacteria & protista, fungi)
End Result: Two genetically identical “daughter cells”

4. Interphase Divided into 3 Stages: G1 (Gap) Stage S (synthesis) Stage
Normal function performed
Cell growth
Organelles replicated
S (synthesis) Stage
Chromatin (DNA strands) duplicated
G2 (Gap) Stage

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 pull ½ the chromatids to each end of the cell
Humans: 46 chromatids each way

8. Telophase 4th stage of mitosis Spindle fibers dissolve
Chromatids unwind into chromatin
Nucleus reforms
Cytokinesis: division of the cytoplasm
not a part of telophase; happens after

10. Cell plate

11. Real Mitosis Video Clip
Animated Mitosis Clip
Real Mitosis Video Clip

12. Name that Stage!
Metaphase

13. Name that Stage!
Telophase

14. Name that Stage!
Interphase

15. Name that Stage!
Prophase

16. Name that Stage!
Anaphase

17. Prophase
Metaphase
Interphase
Telophase
Anaphase

19. Quick Review Mitosis = the division of somatic (non- sex) cells
Each stage has different characteristics
End Result = Two identical diploid daughter cells