1. 5.2 Mitosis and Cytokinesis KEY CONCEPT Cells divide during mitosis and cytokinesis.

2. 5.2 Mitosis and Cytokinesis Chromosomes condense at the start of mitosis. DNA wraps around proteins (histones) that condense it. DNA double helix DNA and histones Chromatin Supercoiled DNA

3. 5.2 Mitosis and Cytokinesis DNA plus proteins is called chromatin. One half of a duplicated chromosome is a chromatid. Sister chromatids are held together at the centromere. Condensed, duplicated chromosome chromatid centromere telomere

4. 5.2 Mitosis and Cytokinesis Parent cell centrioles spindle fibers centrosome nucleus with DNA Interphase prepares the cell to divide. During interphase, the DNA is duplicated. Mitosis and cytokinesis produce two genetically identical daughter cells.

5. 5.2 Mitosis and Cytokinesis Interphase

6. 5.2 Mitosis and Cytokinesis Mitosis divides the cell’s nucleus in four phases. –During prophase, chromosomes condense and spindle fibers form, nuclear membrane disappears

7. 5.2 Mitosis and Cytokinesis

8. Mitosis divides the cell’s nucleus in four phases. –During metaphase, chromosomes line up in the middle of the cell.

9. 5.2 Mitosis and Cytokinesis Metaphase

10. 5.2 Mitosis and Cytokinesis Mitosis divides the cell’s nucleus in four phases. –During anaphase, sister chromatids separate to opposite sides of the cell.

11. 5.2 Mitosis and Cytokinesis Anaphase

12. 5.2 Mitosis and Cytokinesis Mitosis divides the cell’s nucleus in four phases. –During telophase, the new nuclei form and chromosomes begin to uncoil.

13. 5.2 Mitosis and Cytokinesis Telophase and Cytokinesis

14. 5.2 Mitosis and Cytokinesis Cytokinesis differs in animal and plant cells. –In animal cells, the membrane pinches closed. –In plant cells, a cell plate forms.

15. 5.2 Mitosis and Cytokinesis Cytokinesis – Cytoplasm Division Animal Cell Cleavage Furrow Plant Cell Cell Plate

16. 5.2 Mitosis and Cytokinesis Let’s Review the Events of the Cell Cycle Cell Cycle Video Cell Cycle Video #2 Cell Cycle tutorial #1Cell Cycle tutorial Cell Cycle tutorial #2Cell Cycle tutorial Animal Cell Division Plant Cell Division#1Plant Cell Division Plant Cell Division #2

17. 5.2 Mitosis and Cytokinesis