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The Cell Cycle Ms. Brown and Ms. Archie 7th Grade Life Science 1 1 Thursday, December 13: Warm-Up How have you been through different stages in your life? Opening Share warm-up IB Infusion MYP Unit Question: How is the whole greater than the sum of its parts? Area of Interaction: Health and Social Education Learner Profile Term: Thinker Today’s Learning Target Today I am learning the stages of the cell cycle because my body is constantly making new cells! The Cell Cycle Chapter 4 Section 3 In the time it takes you to read this sentence, your body will have made millions of new cells. Making new cells allows you to grow and replace cells that have died. How do little elephants grow up to be BIG elephants? Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun. Cell that reproduce by asexual reproduction reproduce constantly. The Life of a Cell As you grow, you pass through different stages in life. Cell Cycle Your cells also pass through different stages in their life cycle. Cell Cycle: life cycle of a cell The Life of a Cell The DNA of a cell is organized into structures called chromosomes. Chromosomes Copying chromosomes ensures that each new cell will be an exact copy of its parent cell. Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis • • • Occurs before mitosis begins Chromosomes are copied (# doubles) Each chromosome becomes two chromatids Nucleus CELL MEMBRANE Cytoplasm Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • • Mitosis begins (cell begins to divide) Chromosomes condense from long strands into rod-like structures. Animal Cell Plant Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • • The nuclear membrane is dissolved Paired chromosomes align at the cell’s equator Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • • • Two new nuclei form. Chromosomes appear as chromatin (threads rather than rods). Mitosis ends. Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • • In cells that lack a cell wall, the cell pinches in two. In cells that have a cell wall, a cell plate forms between the two new cells. Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase On the back of your notes, draw the stages of the cell cycle. Page 100: Figure 4 28 - Cell Division 29 29 http://www.cellsalive.com/mitosis.htm