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Understanding Mitosis in Somatic Cells

Explore the process of mitosis in somatic cells, where chromosomes are divided to maintain the right number, leading to the formation of two daughter cells. Learn about the phases of mitosis - prophase, metaphase, anaphase, telophase, and cytokinesis.

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Understanding Mitosis in Somatic Cells

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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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