1. The Cell Cycle and Mitosis

2. Cell Cycle
Interphase
Mitosis
Cytokinesis

3. IMPORTANCE 1. Growth 2. Tissue Repair
3. Keeps chromosome number constant.

4. Eukaryotic Cell Cycle 1. Most of cell cycle consists of the interphase
2. Mitosis describes nuclear division

5. INTERPHASE 1. Cell prepares for mitosis 2. Chromosomes duplicate.
(Chromosomes consist of two DNA strands).

6. Eukaryotic Cell Cycle Most of cell cycle consists of the interphase.
Mitosis describes nuclear division.

7. STAGES OF MITOSIS
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

8. PROPHASE 1. Chromosomes coil up and become visible
2. Nuclear membrane disappears.
3. Nucleolus disappears.
4. Spindle appears.
5. Centrioles move toward poles

9. What’s a spindle?
Made of the centriole and microtubules (part of the cytoskeleton)
The fibers attach to the centromere of the chromosome and “reel them in”
Interpretive Dance Time

10. Chromosomes become aligned at the equator of the spindle.
METAPHASE
Chromosomes become aligned at the equator of the spindle.

11. ANAPHASE 1. Chromatids separate. 2. Two identical groups formed.
3. Separated chromatids move to opposite poles of the cell.

12. TELOPHASE 1. Chromosomes uncoil and disappear
2. Nuclear membrane reappears.
3. In plant cells the cell plate appears.
Spindle fibers dissolve

13. Daughter Cell
The cytoplasm becomes divided a process called Cytokinesis and wall formation produces two daughter cells.