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zaria white

on 23 February 2012

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Transcript of Mitosis

Stages of Mitosis jnlkmdlks First Stage: Interphase Second Stage: Prophase Third Stage: Metaphase Fourth Stage: Anaphase Fifth Stage: Telophase Sixth Phase: CytoKinesis The cell spends most of its time in this stage. It increases in size and begins to make a copy of it's DNA as it prepares for division. The nucleolus disappears and chromosomes become coiled, Each pair of sister chromosomes are joined together by a centromere. In the cytoplasm, the two pairs of centrioles move to opposite poles of the cell. Then the nuclear envelope disappears as well. Spindle fibers attach to the centromeres of the chromosomes. The chromosomes align along the equator of the cell. The spindle fibers become shorter and the centromere splits. The fibers pull the daughter chromorsomes to opposite poles. When a complete set of chromosomes is formed, it marks the end of anaphase. The chromosomes begin to uncoil. A nuclear envelope forms around each set and the spindle fibers disappears. Then the nucleolus reforms in each spliting cell. This is the last stage of mitosis. The cell is pinched which splits the cell into two seperate cells. Each new cell has the same number of chromosomes. THE END ^-^ By Or so you thought Enjoy this video
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