1. Mitosis Asexual cell division!! Begins in the nucleus of a cell.

2. How does asexual reproduction occur in humans? MITOSIS –Skin cells –Liver cells

3. MITOSIS 1.Occurs in somatic (body) cells. 2. Does not create sperm and egg. 3. Creates exact copies of a parent cell 4. Used to repair wounds and grow from a zygote  to a person. 5. DNA duplicates itself and then the cell divides

4. MITOSIS

5. Mitosis and the Cell Cycle Remember the letters: I P M A T These letters will help you to remember the order of the 5 stages of the Cell Cycle: 1.Interphase 1.Prophase 1.Metaphase 1.Anaphase 1.Telophase

6. Interphase: Called Resting phase Cell is NOT dividing Performs life functions - Cell grows - Copies all organelles - Copies DNA

7. 1. Interphase: “Prep Period” -Cell preparation for cell division - Two Major Events: 1. Cell increases in size 2. DNA and organelles are replicated (copied) Chromatin: are chromosomes when they are NOT distinguishable and they look like spaghetti.

8. Interphase has 3 parts (takes up about 90% of the cell cycle) 1. G1 - growth one phase (organelles grow) 2. S - synthesis phase (replication of chromosome material) 3. G2 - growth phase two (more organelle and cell growth)

9. MITOSIS - Has 4 phases - Prophase, Metaphase, Anaphase, Telophase

10. Prophase: - DNA changes from chromatin to chromosome - Nucleus breaks apart with nucleolus and nuclear membrane disappears - Centrioles begin to separate and move to poles - Spindle fibers form to connect centrioles

11. Terms: Chromatid: each chromosome strand Centromere: (kinetochore): holds the chromatids together

12. Metaphase: (M is for Middle) Chromosomes line up along the equator (middle) Chromosomes attach to the spindle fibers at their centromeres

13. Anaphase: ( A is for Away) Spindle fibers pull chromosomes apart and move each half of the chromosomes to opposite poles

14. Telophase: the reverse of interphase Nuclear membrane form around each set of chromosomes DNA changes from chromosomes to chromatin Spindle fibers disappear Plant cells -

15. CYTOKINESIS the cell membrane pinches in to split the parent cell into two daughter cells.

16. Compare & Contrast Mitosis in Plants and Animals

17. Plant vs Animal PlantAnimal No centrioles = no spindle fibers Centrioles No astray rays b/c there are no centrioles Astray rays Forms a cell plateCytokinesis to pinch in cell membrane

18. Asexual Reproduction: Mitosis