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Mitosis or sex and the somatic cell Eukaryotes have a fixed number of chromosomes, the number different for different species Chromosomes exist in pairs A somatic cell is a cell that is not involved in reproduction of a new organism When a cell has a complete set of chromosomes it said to be in a diploid condition Mitosis (what did the ice fisherman say to his buddy?) Mitosis Is the division of somatic cells in which the appropriate number of chromosomes is maintained. Cell division consists of interphase, mitosis and cytokinesis Interphase is the time between divisions G1 phase - characterized by growth of the cell S phase is time of DNA synthesis G2 phase characterized by protien synthesis in preparation of mitosis Mitosis (look at pages 190 to 199 in your expensive book) Prophase Metaphase Anaphase Telophase Prophase Chromosomes condense, become visible Metaphase Chromosomes line up along the “equator” the entire cell condenses and chromosomes are more visible than at any other time Anaphase Chromosomes begin to separate into sister chromatids each chromatid is independent of other sister chromatids are pulled toward opposite poles, by now each is a full fledged chromosome anaphase is complete when chromatides arrive at the poles Telophase Final stage of mitosis (whew) a nuclear envelope forms around each set of chromasomes nucleoli appear mitosis is complete Cytokinesis The cytoplasm divides to produce two daughter cells Cytoplasm actually begins during telophase In class exercise Break into groups of 4-6 people write a limerick or a country song about mitosis pick a spokesperson to present it you have 20 minutes