1. Today’s learning outcome: 1) To learn the different phases of mitosis 2) To be able to identify the stages from images

2. Mitosis: 1)Is the division of a nucleus following chromosome replication 2)The two resultant daughter nuclei have the same number of chromosomes as the parent nuclei making them genetically identical 3) Mitosis is involved in asexual reproduction as well as growth and repair of body tissues Mitosis

3. Before mitosis occurs... Before the cell starts to divide, every DNA molecule must replicate The two new molecules remain attached to each other in a small region called the centromere Each DNA molecule becomes super coiled and compact. Each chromosome can now be seen with a light micro scope and appears as two chromatids lying side by side, joined by the centromere

4. The Mitosis Cycle

5. Interphase This is the stage of mitosis when nothing is visible yet it is the most important Because this is when DNA replication occurs

6. Prophase Chromosomes slowly condense and become visible The microtubules break down making the cell spherical in shape

7. PROMETAPHASE Chromosomes have already replicated and are visible as daughter chromatids joined at a centromere. Microtubules called spindle fibres develop from the centrioles (this is only present in animal cells)

8. Metaphase The nuclear envelope breaks down and The chromosomes become attached to spindle fibres, At regions called kinetochores, lining up along equator of the cell. By the end of metaphase, all the chromosomes have lined up along the metaphase plate, with the spindle fibres pulling towards the pole

9. Anaphase Anaphase, begins when the kinetochores split and the daughter chromatids are pulled to opposite poles of the cell by spindle fibres

10. Telophase Telophase can be considered as the reverse of prophase The chromosomes begin to recon dense And new nuclear membranes reform around the two sets of chromosomes

11. A quick visual aid for exams!! It easy!!!!!

12. NOW IDENTIFING IMAGES....