1. Mitosis & the Cell Cycle 12/10/2012

2. Goals for the Day See what we need to review for the semester test! Be able to define what the cell cycle is Be able to define what mitosis is, and what its purpose is Be able to describe the phases of mitosis (nuclear division)

3. Cell Cycle Purpose of the cell cycle to reproduce, repair, & replace cells.

4. Cell Division Before Eukaryotic Cells divide they need to first replicate their control center, so that each new cell has one. In Eukaryotic cells that control center is known as the ____________. I say Eu, you say_______ I say Pro, you say _______

5. Cell Division Before the control center divides it must replicate its most important feature, the _______ which is housed in the nucleus of eukaryotes.

6. Cell Cycle Interphase – where a cell spends the majority of its life (over 90%)

7. Goals for the Day See what we need to review for the semester test! Be able to define what the cell cycle is Be able to define what mitosis is, and what its purpose is Be able to describe the phases of mitosis (nuclear division)

8. Question of the Day In What phase of the cell cycle does a cell spend most of its life (more then 90%)?

9. Cell Cycle Interphase – where a cell spends the majority of its life (over 90%)

10. 5 Phases of the cell cycle 1. First growth (G 1 ) phase cell grows rapidly and carries out its routine functions. 2. Synthesis (S) phase A cell’s DNA is copied 3. Second growth (G 2 ) phase prepares for the nucleus to divide. 4. Mitosis the nucleus of a cell is divided into two 5. Cytokinesis the cytoplasm divides

12. Cell Cycle The purpose of cell division is to reproduce cells. Sometimes cells are not controlled by these genes & proteins Uncontrolled growth = Cancer

13. Cell Cycle Mitosis – can be divided into 5 basic parts Prophase Metaphase Anaphase Telophase –Cytokinesis

14. Mitosis – Cell Division (Cell Reproduction) Mitosis Phases Interphase – This is where a cell spends a majority of its life. Nucleus Cell Membrane

15. Chromatin

17. Prophase – Centrioles and Spindle Fibers start to appear Chromosomes become visible Nuclear Membrane disappears

18. Metaphase – Chromosomes line up in the middle of the cell (“meta” means middle) Centrioles Spindle Fibers Chromosomes

19. Anaphase – Spindle fibers separate the chromatids and pull them to opposite ends of the cell. Centriole Spindle Fibers Chromatids

20. Telophase – Cell membrane starts to pinch in the middle Two new nuclei start to form in each new cell Chromosomes disappear into the nucleus Cytokinesis – the dividing up of the cytoplasm Chromosomes Nuclei Cell Membrane Newt Lung Cell Mitosis

21. Remember IPMAT