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Warm ups: 1. Do living things reproduce? 2. Can cells grow and reproduce? Presenting… The Cell Life Cycle Objective: 1. Explain the process of a cell’s life cycle 2. Differentiate between interphase, mitosis and cytokinesis. How do little elephants grow up to be BIG elephants? Life Cycle of Cells – 3 parts 1. Interphase 2. Mitosis 3. Cytokinesis 1. Interphase - growth a. The cell grows until it is ready to divide. b. Chromosomes (DNA) and other cell parts are copied Interphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm 2. Mitosis – division of the nucleus a. new cells have same dna b. happens in all body cells and in many single celled organisms c. Creates diploid cells – 23 pairs of chromosomes NORMAL CELLS http://www.cellsalive.com/mitosis.htm Chromosomes d. Chromosomes – strands of tightly wound DNA e. Humans have 23 pairs of chromosomes = 46 total chromosomes (23 X 2 = 46) Chromosomes are paired up and numbered. Scientists then put them in order from biggest to smallest. Last pair of are called the sex chromosomes. XY will be male, XX will be female. 4 Parts of Mitosis 1. Prophase - nucleus disappears, chromosomes start moving to middle of cell 2. Metaphase - chromosomes line up in middle of cell (think M = metaphase/middle) 3. Anaphase - chromosomes are pulled away/apart from their copies and move to opposite sides of cell (think A = anaphase/apart) 4. Telophase - nucleus membrane forms, cell gets ready to divide (cytokinesis) Prophase Animal Cell Plant Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Metaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Anaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Telophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm FYI: Why is mitosis so important? • For growth, repair and replacement of cells • Grow and Develop! • Even after growth ends cell division is important to make new cells to replace old cells! Did you know? Billions of blood cells are replaced daily! 3. Cytokinesis: division of cytoplasm a. Animal cells - cell membrane pinches in. b. Plant cells - a cell plate forms to divide the cytoplasm. 20 Exit slip Five finger summary: In the palm of your hand that you have drawn on a piece of paper….write “cell life cycle”. In each finger, write “interphase”, “mitosis”, and “cytokinesis” and write something about them. On your other two fingers, pick a stage of mitosis and explain what happens during that stage. Cell life cycle