1. Notes Module #1 pages 17-19 Cell Cycle and MitosisCell cycle a regular , timedsequence of events of cellgrowth and division throughwhich dividing cells pass.

2. Note: Cell TheoryAll organisms are made ofcellsAll cells come from pre-existing cells 3. Why is cell division(reproduction) needed:to grow,to repair injuries, andto replace dead/dyingcells. 4. Parts of the Cell Cycle:1. Interphase The part of the cell cycle that occurs before mitosis. 90% of time a cell is in this phase 5. Parts of the Cell Cycle: 1. Interphase there is no distinguishablechromosomes, Genetic material is calledchromatin 6. Phases of interphase:G1 phase:period prior to the synthesis ofDNAthe cell increases in mass inpreparation for cell divisionThe G in G1 represents gap andthe 1 represents first, so the G1phase is the first gap phase. 7. Phases of interphase:S phase:The period during which DNAis replicated or synthesized.The S represents synthesis. 8. Phases of interphase:G2 phase:After DNA synthesis but priorto the start of prophaseCell synthesizes proteins andcontinues to increase in sizeSecond (2) gap (G) 9. Parts of the Cell Cycle:1. Interphase2. Mitosis - the process in whicha eukaryotic cell separates thechromosomes in its cell nucleusinto two identical sets in twodaughter nuclei. 10. Four phases of mitosis:Phase 1: Prophasechromosomes become visible the nuclear membranedisappearscentrioles duplicate/spindlesform 11. Four phases of mitosis:Phase 1: Prophase 12. Phase 2: Metaphase chromosomes reach theequatorial plane (middle) microtubules attach at sameplace the sister chromosomes areattachedand the microtubules begin topull chromosomes 13. Metaphase 14. Phase 3: Anaphase microtubules go to work like atugboat, pulling each pair ofchromosomes apart towardopposite ends of the cell 15. Phase 3: Anaphase 16. Phase 4: Telophase Chromosomes are now atopposite ends of the cell A nuclear membrane forms around each set of chromosomes 17. Phase 4: Telophase 18. Parts of the Cell Cycle:1. Interphase2. Mitosis3. Cytokinesis division of the cells cytoplasmbegins prior to the end of mitosisand completes shortly aftertelophase/mitosisAt the end of cytokinesis, there aretwo distinct daughter cells. 19. Figure 3.15