1. The Cell Cycle

2. Cell Division is Mitosis For single celled organisms, this increases their population.For single celled organisms, this increases their population. For multi-celled organisms, this is for growth, repair, & differentiation.For multi-celled organisms, this is for growth, repair, & differentiation.

3. Basic Steps Duplicate DNADuplicate DNA Divide chromosome into 2 complete sets.Divide chromosome into 2 complete sets. Divide into 2 identical daughter cellsDivide into 2 identical daughter cells

4. Stages of the Cell Cycle InterphaseInterphase MitosisMitosis –Prophase –Metaphase –Anaphase –Telophase –Cytokinesis

5. Interphase 90% of the time the cell is in this phase.90% of the time the cell is in this phase. Preparing for division.Preparing for division. –Copies organelles 7 centrioles

6. Prophase – the start of mitosis Chromosomes condense.Chromosomes condense. Centrioles move to opposite sides.Centrioles move to opposite sides. Spindle fibers form.Spindle fibers form. Nuclear membrane gone.Nuclear membrane gone. The chromosome & their copy are called sister chromatids.The chromosome & their copy are called sister chromatids.

7. Metaphase Sister chromatids are aligned at the center of cell (the equator).Sister chromatids are aligned at the center of cell (the equator).

8. Anaphase Sister chromatids move towards each side.Sister chromatids move towards each side. Once separated, the chromatids are now chromosomes again.Once separated, the chromatids are now chromosomes again.

9. Telophase Chromosomes are at each side & become chromatin again.Chromosomes are at each side & become chromatin again. Spindle fibers dissolve.Spindle fibers dissolve. Nuclear membrane reforms at each side.Nuclear membrane reforms at each side.

10. Cytokinesis in Animal Cells Cytoplasm and organelles are divided equally.Cytoplasm and organelles are divided equally. Animal cells have the cell membrane pinch inward to divide cell.Animal cells have the cell membrane pinch inward to divide cell. 2 identical daughter cells.2 identical daughter cells.

11. Cytokinesis in Plant Cells Cytoplasm and organelles are divided equally.Cytoplasm and organelles are divided equally. Cell plate forms in the middle and becomes the cell membrane.Cell plate forms in the middle and becomes the cell membrane. Cell wall forms between the membranes.Cell wall forms between the membranes.

12. Binary Fission Prokaryotic cells use this method.Prokaryotic cells use this method. –Bacteria. A simple, fast split.A simple, fast split.