1. Cells divide during the mitotic phase Ch. 9.3

2. INTERPHASE Starts during the G 2 phase in the cell cycle Chromatin loosely packed Nucleolus visible Nuclear envelope in tact

3. Example of Interphase

4. Prophase Nuclear envelope breaks down Chromatin condenses to form chromosomes Centrioles form spindle Nucleolus not visible

5. Example of Prophase

6. Metaphase Spindle stretched from pole to pole (made of microtubules) Chromosomes aligned in MIDDLE of cell Centrioles at pole of cell

7. Example of Metaphase

8. Anaphase Sister chromatids separate and move AWAY from center

9. Example of Anaphase

10. Telophase and Cytokinesis Chromosomes uncoil Nuclear envelope reforms Nucleolus becomes visible Pinching of cytoplasm = CYTOKINESIS (forms CELL PLATE in plants)

11. Example of Telophase

12. Concept Check Describe a significant event that occurs in each of the four stages of mitosis. Compare and contrast cytokinesis in animal and plant cells. In what sense may prophase and telophase be characterized as opposites?