1. Wednesday, March 2 nd Big Idea: Cell Division Daily target: I can explain how organisms grow. Homework: Fermentation Lab (3/4) Entry Task: Probe Conclusion: How are chromatin and chromosomes related? Plan for Today: Discuss cell division Cell Cycle Cell division activity Mitosis videoMitosis video Cell division ppt start Vocabulary: Telophase: the final phase of cell division, in which the chromatids or chromosomes move to opposite ends of the cell and two nuclei are formed with nuclear envelope visible and the final stage of cytokinesis begins.

3. CELLULAR DIVISION THERE ARE 3 STAGES OF CELL CYCLE. INTERPHASE MITOSIS CYTOKINESIS THERE ARE FOUR PHASES OF MITOSIS CELL DIVISION PMAT PROPHASE METAPHASE ANAPHASE TELOPHASE THAT CENTER AROUND THE NUCLEUS AND THE CHROMOSOMES. A human liver cell, for example, completes one cell cycle in about 22 hours

4. INTERPHASE 95% OF THE CELL CYCLE THIS IS WHERE THE CELL SPENDS MOST OF ITS’ TIME JUST CARRYING ON THE NORMAL FUNCTIONS OF A CELL OR GROWTH(40%) DNA REPLICATION (45%) THIS IS WHERE THE NUCLEUS PREPARES THE DNA TO BE PLACED IN CHROMOSOME SETS FOR CELL DIVISION PREPARATION FOR DIVISION (10%) THE CELL BUILDS UP ATP FOR MITOSIS AND CENTRIOLES ARE COPIED.

5. MITOSIS 4% OF CELL CYCLE PROPHASE PRO – MEANS FIRST NUCLEAR MEMBRANE BREAKS DOWN. CHROMATIN CONDENSES INTO CHROMOSOMES – THEY GET SHORT AND FAT. CENTRIOLES MOVE TO OPPOSITE SIDES OF THE CELL. SPINDLE FIBERS FORM.

6. MITOSIS 4% OF CELL CYCLE METAPHASE META MEANS MIDDLE THE CHROMOSOMES LINE UP IN THE MIDDLE OF THE CELL. THE CHROMOSOMES ATTACH TO THE SPINDLE FIBERS.

7. REVIEW MITOSIS: CAN YOU DRAW A CELL DURING METAPHASE (MIDDLE)? DRAW THE CENTRIOLES WITH SPINDLES REACHING OUT DRAW THE CHROMOSOMES WITH CENTROMERES IN THE MIDDLE MAKE SURE THE CHROMOSOMES ARE IN THE CORRECT LOCATION FOR METAPHASE

8. MITOSIS 4% OF CELL CYCLE ANAPHASE THIS IS WHERE THE CHROMOSOMES MOVE APART FROM EACH OTHER. THE CHROMATID SEPARATE AND EACH NEW SET OF CHROMATID BECOMES A NEW CHROMOSOME

9. MITOSIS 4% OF CELL CYCLE TELOPHASE THE CHROMOSOMES ARE APART AND THE NUCLEUS ACTUALLY IS DIVIDED. NUCLEAR MEMBRANE REAPPEARS SPINDLE FIBERS BREAK DOWN CHROMOSOME BECOME THIN CHROMATIN NUCLEUS DIVIDE

10. CYTOKINESIS ABOUT 1% CELL CYCLE THE CELL MEMBRANE PINCHES(FURROWING) IN AROUND THE MIDDLE OF THE CELL HALF OF THE ORGANELLES IN THE PARENT CELL SPLIT EVENLY INTO BOTH NEW DAUGHTER CELLS PARENT CELL CYCLE IS COMPLETE

11. 4 PHASES OF MITOSIS IN AN ACTUAL CELL: Prophase: Chromatin coil and shorten to become chromosomes so you can see them. Metaphase: Chromosomes line up in the middle of the cell. Anaphase: spindle fibers pull the chromosomes apart. Telophase: cell splits, chromosom es uncoil, nuclear envelope re-forms.