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Transcript
Cell Growth and Division The Cell Cycle & Mitosis ¿ Are cells always dividing? Sometimes they are growing Sometimes they are preparing to divide Sometimes they are dividing Cell Division = Mitosis During life, we go from one cell to ~ 75 trillion cells. Mitosis = division of body cells Cancer = uncontrolled cell division Cells that rarely divide Mature skeletal muscle cells Nerve cells Cells that constantly divide Skin cells Cells that line gastro-intestinal tract Cell cycle = Period of time between one cell division & the next Cell cycle – Phases I. Interphase G1 - rapid cell growth - basic cell f(x)s I. Interphase S = Synthesis – DNA replication G2 = Organelles & cytosol made G1 S G2 Cell cycle - Phases II. Mitosis = cell division III. Cytokinesis = cytoplasm division ?s 1-7 Sequence of Cell Cycle Interphase Prophase Metaphase Anaphase Telophase Mitosis Includes : Prophase Metaphase Anaphase Telophase Cytokinesis (division of cytoplasm) Cell during Interphase : DNA in form of chromatin Looks like hair / spaghetti (chrs. * not visible) * chromosomes Prophase Chrs. coil and become visible Sister chromatids move towards poles Spindle forms Nuclear envelope & nucleoli disappear Metaphase Sister chromatids line up at equator on metaphase plate (Meet me in the middle) Anaphase Centromeres divide, chromatids split Sister chromatids move to opposite poles (centrioles) (Run away, run away!) Telophase Chrs. uncoil and become invisible (now in form of chromatin) Spindle disappears Nuclear envelope & nucleoli re-appear Cytokinesis Division into two identical DAUGHTER CELLS Starts during Telophase Finishes after Telophase is over animation Whitefish cells during mitosis ?s 8-15