1. Cell Reproduction

2. Why Cells Divide Cell death Repair of injury Growth/development Maintains cell size

3. Cell cycle Interphase(Preparation for division) – Growth G1 – DNA replication S – Spindle fibers and centrioles forming G2 Mitosis Cytokinesis

4. Mitosis Nuclear division 4 stages – Prophase – Metaphase – Anaphase – telophase

5. Mitosis Asexual reproduction in somatic cells (body cells) Parent cell splits to make two identical daughter cells. (same number of chromosomes as parent cell) Some organisms reproduce asexually such as:

6. Cell Cycle

7. Interphase-Resting and Preparation G1 S G2

8. Prophase

9. Metaphase

10. Anaphase

11. Telophase

12. Cytokinesis-division of cytoplasm

13. Regulation of the cell cycle Varies with type of cell Involves proteins and enzymes Cyclins bind to enzymes, cyclin-dependent kinases Checkpoints monitor for DNA damage and for correct division of chromosomes

14. Cancer Uncontrolled cell growth and division of cells Failure of regulation of the cell cycle Causes Risks Prevention genetics

15. Apoptosis Programmed cell death examples

16. Stem cells Embryonic adult

17. Meiosis Need for sex cells (gametes) with half the original chromosome number. 2 divisions

18. Meiosis Meiosis IMeiosis II

19. MitosisMeiosis Function Location in Body Number of Daughter Cells Change in Chromosome Number (Beginning/End) Number of Phases Number of Cell Divisions Difference in DNA Between Parent Cell and Daughter Cells

20. Mitosis vs. Meiosis http://www.pbs.org/wgbh/nova/miracle/divid e.html http://www.pbs.org/wgbh/nova/miracle/divid e.html