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Cell Cycle 1 1 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. Animated Cell Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis Stage 1- Interphase Longest part of cell life Cell carries out normal activities DNA in long strands called Centrioles chromatin Centrioles as a pair Late Interphase • • • Chromatin doubles to form chromosomes (# doubles) Other cell parts also double Editing of DNA to repair errors Centrioles Nucleus CELL MEMBRANE Cytoplasm Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Stage II- Mitosis Phase # 1- Prophase • • • Chromosomes coil and become visible Centrioles (or poles) appear and begin to move to opposite end of the cell. Spindle fibers form between the poles. Nuclear membrane disappears. Centrioles Sister chromatids Spindle fibers Animal Cell Plant Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Phase # 2- Metaphase • Chromosomes line up in the middle of the cell on the spindle fibers. Centrioles Spindle fibers Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Phase # 3- Anaphase • Chromatids (or halves of chromosomes) separate and begin to move to opposite ends of the cell. Centrioles Spindle fibers Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Phase # 4 - Telophase Chromatids finish separating. • Nuclear membrane reforms • Chromatids unwind and become chromatin. • Nuclei Chromatin Nuclei Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm STAGE III - Cytokinesis • • Cytoplasm and cell organelles divide evenly Two new cells are formed Animal Cell Cycle -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase Plant Cell Cycle -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase 19 20 20 http://www.cellsalive.com/mitosis.htm
