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Cell Cycle & Mitosis!!!

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This is a clear to understand presentation about the cell cycle and the process of mitosis. After reading this, you will get a deeper sense of the importance of cell cycle and mitosis that is going on inside every living thing.

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Cell Cycle & Mitosis!!!

  1. 1. CELL CYCLE & MITOSIS
  2. 2. Cell Cycle   90% of the cell cycle is in interphase, other 10% is mitosis (cellular division) Interphase composed of 3 phases: G1, S, and G2  G1 (Gap 1) phase: cellular growth and protein synthesis, in preparation for the S phase  S (Synthesis) phase: DNA synthesis/replication of each chromosome in the cell, forms sister chromatids.  G2 (Gap 2) phase: cellular growth as well as protein & lipid synthesis, in preparation for mitosis  Ex. Synthesis of proteins used to form mitotic spindle
  3. 3. Mitosis      Cellular division of a cell Makes exact copy of mother cell Produces 2 identical daughter cells Each product has same # of chromosomes Purpose of mitosis?   To form a multicellular organism from a zygote To replace dead or lost cells, such as skin and red blood cells
  4. 4. Phases of Mitosis: (PMAT) + cytokinesis      Prophase: chromosomes become visible, begin to condense Prometaphase: nuclear envelope disappears and chromosomes attach to mitotic spindle Metaphase: chromosomes line up at metaphase plate/equatorial plane Anaphase: sister chromatids separate by kinetochores Telophase: two daughter nuclei reform at the 2 poles  Cytokinesis (division of the cytoplasm) occurs simultaneously
  5. 5. Interphase Metaphase Prophase Anaphase
  6. 6. Mitosis in plant cells differ from mitosis in animal cells   Plant cells do not form centrioles during mitosis Plant cell walls are too rigid to form cleavage furrow  Forms cell plate instead
  7. 7. Telophase/cytokinesis in a plant cell cell plate
  8. 8. Telophase/cytokinesis in an animal cell cleavage furrow
  9. 9. Some terms    Gene: portion of DNA that encodes RNA and protein; determines your characteristics—freckles, height, eye color… Chromosomes: contain DNA and protein; compact way of carrying all genetic info Sister chromatids: copies of chromosomes joined together
  10. 10. Activities   A. Bead modeling B. View plant/animal cell slides   Part 1:View & draw Alium onion root tip, estimate % of time in each phase, answer questions Part 2: View & draw White fish blastulae, estimate % of time in each phase, answer questions  Exercise slide) B: write answers on whiteboard (details on next

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