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The differences between plant and animal cells 1 1 Chromosomes are copied (# doubles) • All organelles and cytoplasm double • Chromosomes appear as long thin threadlike coils (chromatin) • Nucleus Cell Membrane Cytoplasm Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Centrioles (or poles) appear • Spindle fibers form near centrioles. • Centromeres appear, hold chromosomes together • Nuclear membrane begins to disappear • Chromosomes Centrioles Centromere Spindle fibers Animal Cell Plant Cell Spindle fibers Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • Chromosomes attach to the spindle fibers. • Chromosomes line up in center of cell Chromosomes Centromere Centrioles Spindle fibers Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • • • Centrioles tug on spindle fibers Chromosomes separate and begin to move to opposite ends of the cell. Centromeres disappear Centrioles Spindle fibers Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Two new nuclei form. • Spindle fibers and centrioles disappear. • Mitosis ends. • Nuclear membrane Chromosomes Nuclear membrane Chromosomes Cytoplasm Divides • Animal Cell - Cell membrane moves inward • Plant Cell – Cell plate moves outward Animal Plant Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Animal Cell Division- Review Interphase Metaphase Telophase Prophase Anaphase Cytokinesis Plant Cell Division- Review Interphase Prophase Metaphase Anaphase Telophase Cytokinesis Three reasons why cells reproduce asexually: Growth- needed so organisms can develop Repair- injured tissues Replace – worn out cells What type of cells never leave interphase? Muscle Nerve Skin cancer - the abnormal growth of skin cells most often develops on skin exposed to the sun. How does it develop?? Cells that reproduce by asexual reproduction reproduce constantly. 19 - Cell Division 20 20 http://www.cellsalive.com/mitosis.htm How do little elephants grow up to be BIG elephants? The process of asexual reproduction begins after a sperm fertilizes an egg. Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase • Cytokinesis
