1. 1 1 Asexual Reproduction presents: Mrs. Stewart Honors Biology: Cell Growth and Division

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3. How do little elephants grow up to be BIG elephants? BELL WORK

4. Are the cells of the adult elephant larger than those of the baby? BELL WORK

5.  CLE 3210.4.2Describe the relationships among genes, chromosomes, proteins, and hereditary traits. 11/01/11

6.  Evaluate the reasons for asexual reproduction in organisms  Differentiate between the different stages of the cell cycle in terms of order of occurrence, and chromosome location 11/01/11

7. Why do animals shed their skin? THINK – PAIR - SHARE

8. 11/01/11 How does a cut heal? THINK – PAIR - SHARE

9.  Three reasons why cells reproduce by asexual reproduction: 1. Growth 2. Repair 3. Replacement 11/01/11

10. Cell Membrane not large enough to maintain needs coming in/going out DNA, used for protein synthesis, cant keep up with demands Organelles unable to keep up with demands (ie: waste removal)

11. 11/01/11 Somatic Cells Every cell in the body EXCEPT reproductive cells (gametes) Gamete Sexual reproduction cells Example: sperm for males, Ova/eggs for females

12.  What do they look like?  How many do humans have? They look like an “X” just before the cell divides and an “I” after they divide. 46 (23 pairs) - (23 from mom, 23 from dad)

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14. Which phase does the cell spend the most time in? Interphase

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16. INTERPHASE ANAPHASE PROPHASETELOPHASE METAPHASECYTOKINESIS CELL CYCLE

17. 11/01/11 Time between cell divisions 90% of a cell’s life 3 phases: 1.G1: Growth and everyday activities 2.S: DNA replication 3.G2: preparation for Mitosis (production of necessary proteins/organelles)

18. The process of dividing the nucleus to create two daughter cells, identical to the mother cell Mitosis

19. 11/01/11 Mitosis Creates two daughter cells that are identical to each other AND identical to the parent cell Creates diploid cells (two sets of chromosomes in each daughter cell) Allows organisms to grow Allows organisms to replace damaged/worn out cells P-M-A-T-C

20. 11/01/11 The DNA (chromatin) organizes into chromosomes The nuclear membrane disappears Centrosomes (centrioles) move to opposite ends of cell

21. 11/01/11 Chromosomes attach to spindle fibers (by their centromeres), and line up at the center of the cell Spindle Fibers – microtubules that help separate chromosomes during division

22. 11/01/11 Chromosomes separate at the centromere, and the sister chromatids are pulled toward opposite ends of the cell.

23. 11/01/11 Chromosomes disorganize and the nuclear membrane begins to reform.

24. 11/01/11 The division of the cell cytoplasm, usually beginning during Telophase and finalizing the production of two new daughter cells. Each new cell will have about ½ of the cytoplasm and organelles of the parent cell.

25. 11/01/11 CLEAVAGE FURROW VS. CELL PLATE ANIMAL Cleavage furrow indentation of the cell membrane to form two separate cells Plants Cell plate A cell wall is rigid and cannot flexibly move and pinch together to separate the newly formed cells. So, a cell plate forms between the two new cells. This cell plate will harden and become a cell wall for each.

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27.  Interphase  Prophase  Metaphase  Anaphase  Telophase  Cytokinesis  I PLAY MUSIC AT THE CLUB 11/01/11 I P M A T C

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29. Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Cytokinesis

30. Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Cytokinesis

31.  Create a mnemonic device to help you remember – I-P-M-A-T-C  We will vote on the best one tomorrow in class. Winner gets a two day “slack” pass. 11/01/11

32. Y EXIT TICKET: Identify the following: Structure X Structure Y Stage of the cell cycle