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Asexual Reproduction presents:

Asexual Reproduction presents:. Mrs. Stewart Honors Biology: Cell Growth and Division. 1. 1. MITOSIS A CELL GROWTH AND DIVISION PRODUCTION. BELL WORK. How do little elephants grow up to be BIG elephants ?. BELL WORK .

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Asexual Reproduction presents:

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

  2. MITOSIS A CELL GROWTH AND DIVISION PRODUCTION

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

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

  5. Why do animals shed their skin?

  6. How does a cut heal?

  7. Asexual reproduction Requires only ONE parent • Three reasons why cells reproduce by asexual reproduction: 1. Growth 2. Repair 3. Replacement

  8. At what point does it become necessary for a cell to divide? When the cells resources are under too great a strain from it’s size • 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)

  9. Bandwidth Example How fast can you surf the internet, download an app or play your video games online? Does the amount of other people using the connection matter?

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

  11. Stages: • Interphase • G1 • S • G2 • Mitosis – M phase • Prophase • Metaphase • Anaphase • Telophase • Cytokinesis Cell Cycle

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

  13. CELL CYCLE Create your graphic organizer

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

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

  16. 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

  17. The DNA organizes into chromosomes • The nuclear membrane disappears PROPHASE Chromatin – (visible DNA) - DNA tightly wrapped around proteins Chromosomes – (condensed chromatin) – thread-like structures to allow DNA to be passed from parent to daughter cells

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

  19. Chromosomes separate at the centromere, and the chromatids are pulled toward opposite ends of the cell. ANAPHASE

  20. Chromosomes disorganize and the nuclear membrane begins to reform. TELOPHASE

  21. 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. CYTOKINESIS

  22. CLEAVAGE FURROW VS. CELL PLATE 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. ANIMAL Cleavage furrow indentation of the cell membrane to form two separate cells CYTOKINESIS

  23. CLEAVAGE FURROW VS. CELL PLATE

  24. REMEMBER: • Interphase • Prophase • Metaphase • Anaphase • Telophase • Cytokinesis • IPLAY MUSIC AT THE CLUB I P M A T C

  25. Musical chairs

  26. Animal Mitosis -- Review

  27. Plant Mitosis -- Review

  28. EXIT TICKET: Y • Identify the following: • X • Y • Stage of the cell cycle

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