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Mitosis: PMAT Paco Made a Taco All the steps: I, Punxsutawney Phil make all the calls 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. Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm • Interphase • Prophase • Metaphase • Anaphase • Telophase & Cytokinesis • • • Chromosomes are copied (# doubles) Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase Cell increases in size and copies/doubles its chromosomes to prepare for cell division. Nucleus CELL MEMBRANE Cytoplasm Animal Cell Plant Cell Mitosis begins (cell begins to divide) • Chromosomes appear • Nuclear membrane disappears • Centrioles (or poles) appear and begin to move to opposite end of the cell. • Spindle fibers form between the poles. • Centrioles Sister chromatids Spindle fibers Animal Cell Spindle fibers Plant Cell • • Chromatids (or pairs of chromosomes) attach to the spindle fibers. Chromosomes line up in the middle of the cell Centrioles move to opposite poles. Centrioles Spindle fibers Animal Cell Plant Cell • Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. Centrioles Spindle fibers Animal Cell Plant Cell • • • Two new nuclei form. Chromosomes appear as chromatin (threads rather than rods). Mitosis ends. Nuclei Chromatin Nuclei Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • Cell membrane pinches inward in animal cells to create two daughter cells – each with its own nucleus with identical chromosomes. In plant cells, a cell plate forms to divide the one cell into two identical daughter cells. Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase 21 - Cell Division 22 22 http://www.cellsalive.com/mitosis.htm