1. Mitosis Video Clips of the Process of Cell Division

2. History and Intro to Mitosis

3. Interphase

4. Interphase Review • Resting stage • Chromosomes thicken up and become visible • Homologous pairs • Two chromosomes with the same traits • 23 pairs in humans

5. Prophase

6. Prophase • Nuclear membrane begins to disappear • Chromosomes produce copies of themselves • Knot in middle is called a centromere

7. Metaphase

8. Metaphase • Centrioles move to opposite ends of the cell • Spindle fibers go between the centrioles • Chromosomes are fastened to the spindle fibers at the centromere • Chromosomes line up in the middle of the cell

9. Anaphase

10. Anaphase • Chromosome pulls apart at the centromere • Chromosomes move to opposite ends of the cell

11. Telophase

12. Telophase • Two new cells are formed • Nuclear membrane returns • Comparison of new cell with original cell • Same numbers of chromosomes • Same chromosomes (with traits) • Cytokinesis – division of cytoplasm • Animal (cell membrane) pinches • Plant (cell wall) grows from edges to middle

14. Why do cells reproduce? • To replace old cells • To heal wounds • To grow

15. What are cells called that are not exact copies of the original cells? • Cancer cells