1. Cell Division Mitosis

2. Produces 2 cells – called daughter cells – from one parent cell Daughter cells are identical to each another and to the original parent cell Most body cells reproduce this way Similar to binary fission –Asexual reproduction of organisms without a nucleus

3. Mitosis Occurs because: –Multi-cellular organisms grow in size and complexity by making more cells –Old and damaged cells are continuously replaced by the division of cells –Single-celled organisms such as bacteria divide to make new, independent organisms Binary fission – asexual reproduction

4. Mitosis The nucleus of the cell divides in two –The nucleus contains the genetic material – chromosomes – of the organism Chromosomes are made of DNA

5. Mitosis The Cell Cycle The nucleus divides in several phases: –Interphase –Prophase –Metaphase –Anaphase –Telophase

6. Mitosis Interphase Technically not part of mitosis A resting phase DNA (Chromosomes) copies itself exactly (replicates) Organelles double in number, to prepare for division

7. http://www.biologycorner.com/bio1/cellcycle.html

8. http://www.iknow.net/CDROMs/cell_cdrom/cell3.html

9. Mitosis Prophase Nuclear membrane disappears Spindle fibers (or aster fibers) form at the ends of the cell Chromosomes coil up and become short and fat - become visible Takes about an hour

10. http://www.biologycorner.com/bio1/cellcycle.html

11. http://www.iknow.net/CDROMs/cell_cdrom/cell3.html

12. Mitosis Metaphase Chromosomes in pairs line up along the equator – middle of cell Spindle fibers attach to the center of the chromosome pairs –Centromere – the connecting point of the two chromosomes Takes about 15 minutes

13. http://www.biologycorner.com/bio1/cellcycle.html

14. http://www.iknow.net/CDROMs/cell_cdrom/cell3.html

15. Mitosis Anaphase Chromosomes divide Chromatids (half of a chromosome pair) separate and are pulled to opposite ends of the cell by the spindle fibers Takes about 10 minutes

16. http://www.biologycorner.com/bio1/cellcycle.html

17. http://www.iknow.net/CDROMs/cell_cdrom/cell3.html

18. Mitosis Telophase Nuclear membrane forms around each group of chromosomes Chromosomes unwind and become long and thin again Cytokinesis begins

19. http://www.biologycorner.com/bio1/cellcycle.html

20. http://www.iknow.net/CDROMs/cell_cdrom/cell3.html

21. Mitosis Cytokinesis Cytoplasm divides One cell becomes two individual cells Different in plants and animals –Animals: Cell membrane pinches in –Plants: Cell wall forms down the center http://www.dundee.ac.uk

22. http://www.biologycorner.com/bio1/cellcycle.html

23. http://www.iknow.net/CDROMs/cell_cdrom/cell3.html

24. Animation http://www.johnkyrk.com/mitosis.html

25. Animation http://www.cellsalive.com/mitosis.htm