1. Mitosis and Cell Division

2. The Cell Cycle
As eukaryotic cells grow and divide, they pass through a cell cycle that consists of 3 stages:
Interphase
Mitosis (cell division)
Cytokinesis (cell division)

4. The length of time to complete a cell cycle is different for different types of cells:
Embryonic cells divide rapidly
Adult nerve cells may never divide

5. Stage 1: Interphase Interphase is the longest stage of the cell cycle
The cell performs its normal functions and, in preparation for cell division, duplicates its genetic material (DNA)

7. Stage 2: Cell Division - Mitosis
Consists of 4 phases: Prophase Metaphase Anaphase Telophase

8. Mitosis Phase 1:Prophase
DNA compacts into visible form as chromosomes
Each chromosome contains two strands called sister chromatids.
Sister chromatids are held together by a centromere
The nuclear membrane breaks down

9. Mitosis Phase 2: Metaphase
Chromosomes line up in the middle of the cell.

10. Mitosis Phase 3: Anaphase
The centromere splits and sister chromatids separate.
They are now called daughter chromosomes.
They move to opposite ends of the cell, pulled by spindle fibres

11. Mitosis Phase 4: Telophase
Final phase of mitosis.
Chromosomes stretch out and are no longer visible.
A new nuclear membrane forms around each group of daughter chromosomes.

12. Stage 3: Cell Division - Cytokinesis
Final stage of cell division and cell cycle
The cytoplasm divides and two genetically identical cells are formed.
In a plant cell, a plate develops into a new cell wall
In an animal cell, the cell membrane is pinched off in the centre

13. I, PMAT C (i, robot clip: http://www.youtube.com/watch?v=s0f3JeDVeEo)