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Transcript
Mitosis Notes CELL DIVISION • 1 cell ÷ into 2 identical daughter cells (same genetic info) • Eukaryotes (cells w/ nucleus) go through 2 stages of ÷ • Mitosis – ÷ of nucleus – Cytokinesis – ÷ of cytoplasm Cell cycle = Life span of the cell G1 phase – cell grows, makes more organelles & proteins S phase – chromosome replication (S = synthesis = “to make”) G2 phase – molecules & organelles required for cell ÷ produced M phase – mitosis & cytokinesis G1 phase S phase G2 phase Cell cycle = Life span of the cell cont… • G1, S and G2 make up INTERPHASE. Cell spends a majority of its life in this phase. • M phase is CELL ÷. Relatively small portion of cell’s life. MITOSIS • 4 phases of nuclear division Prophase • Longest phase of mitosis • Chromosomes become visible • Centriole pairs begin to separate • Spindle fiber forms (made of microtubules) • Nuclear envelope breaks down • Spindle begins to attach to chromosomes at centromere Metaphase • Chromosomes line up across center of the cell • Centromere connected to spindle fibers • Centriole pairs at opposite ends of cell Anaphase • Sister chromatid split apart • Chromosomes get pulled to opposite poles by shrinking spindle fibers • Chromosomes form “V” shape as they get dragged through the cytoplasm Telophase • Chromosomes decondence • Nuclear envelope reforms around each set of chromosomes at opposite ends of cell • Spindle fiber breaks apart • 2 nuclei are formed Cytokinesis • ÷ of cytoplasm • 2 new daughter cells are formed w/ same number of chromosomes as original cell. Video of Mitosis • Mitosis Movie • http://www.cellsalive.com/mitosis.htm • http://www.youtube.com/watch?v=CzPGhYiGyZ8 • http://www.youtube.com/watch?v=vFf2dWZZtVg Homework • Obj. 14.1 and 14.2 (Meiosis) • Make a special table where you write similarities and differences between Meiosis and Mitosis or a Venn Diagram • Discuss and stamp Wednesday • Current Event due Friday • Friday, last day to turn in progress reports (signed) Similarities Differences