1. Objective: You will be able to give the purpose of mitosis. Do Now: Read “Division of the Cell” on p. 243 What must a cell do BEFORE cell division occurs?

2. Mitosis When a cell becomes too big it will divide in half We call cell division mitosis

3. DNA and Chromsomes Taking DNA and packing it together forms chromosomes –So for us these two terms are synonymous We can see DNA when it is packed into chromosomes

4. Figure 12.2 Eukaryotic chomosomes

5. Mitosis overview The whole point of mitosis is to copy DNA (chromosomes) exactly and then split into two cells. –You end up creating two cells that are exactly alike –Two new cells are called daughter cells

6. Mitosis is used for: Growth Repair Asexual reproduction

7. Activity View onion slides to look for chromosomes Find a cell that has chromosomes Draw the cell and its chromosome Find another cell with chromosomes doing something different Draw at least 4 cells

8. Figure 12-09x Mitosis in an onion root

9. Objective: You will be able to draw the stages of mitosis. Do Now: Read “Chromosomes” on p. 244-245 Define Chromatids and centromere

10. Chromosomes When chromosomes copy themselves they form a double chromosome –Each piece is called a sister chromatid They are exactly the same A centromere holds the two sister chromatids together Chromosomes double during a stage called interphase

11. Figure 12.3 Chromosome duplication and distribution during mitosis

12. Figure 12.9 Mitosis in a plant cell Prophase

13. Figure 12.0 Mitosis

14. Individual activity You are going to draw and label a cell undergoing mitosis Use your notes to help Draw a cell that has 4 chromosomes Use a different color for each part Label: –Chromosomes –Nuclear membrane –Spindle fibers –Centrioles

15. Objective: You will be able to compare and contrast cell division in plant and animal cells. Do Now: Read “Cytokinesis” on p. 248 Define cytokinesis

16. Figure 12.4 The cell cycle

17. Cell Cycle During Interphase: –Cell grows –Chromosomes double Mitosis is the division of the nucleus (chromosomes) Cytokinesis is the division of the cell (cytoplasm)

18. Figure 12.8 Cytokinesis in animal and plant cells

19. Plant versus animal division Plants don’t use centrioles, animals do In animals, the cell pinches inward In plants, Cytokinesis happens be forming a cell plate

23. Paired activity Use the microscope to view animal cells undergoing mitosis Find one cell for each phase –Prophase, metaphase, anaphase and telophase Draw one cell for each stage in your notes