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Mitosis

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

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Mitosis

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  1. Mitosis or sex and the somatic cell

  2. 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

  3. Mitosis(what did the ice fisherman say to his buddy?)

  4. Mitosis • Is the division of somatic cells in which the appropriate number of chromosomes is maintained. • Cell division consists of interphase, mitosis and cytokinesis

  5. Interphaseis 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

  6. Mitosis (look at pages 190 to 199 in your expensive book) • Prophase • Metaphase • Anaphase • Telophase

  7. Prophase • Chromosomes condense, become visible

  8. Metaphase • Chromosomes line up along the “equator” • the entire cell condenses and chromosomes are more visible than at any other time

  9. 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

  10. Telophase • Final stage of mitosis (whew) • a nuclear envelope forms around each set of chromasomes • nucleoli appear • mitosis is complete

  11. Cytokinesis • The cytoplasm divides to produce two daughter cells • Cytoplasm actually begins during telophase

  12. 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

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