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  1. 1. MEIOSIS!<br />Thurs., Sept. 30, 2010<br />
  2. 2. STAGES OF MEIOSIS:<br />MEIOSIS I<br />Prophase I<br />Metaphase I<br />Anaphase I<br />Telophase I<br />MEIOSIS II<br />5. Prophase II<br />6. Metaphase II<br />7. Anaphase II<br />8. Telophase II<br />
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  4. 4. Meiosis I<br />All stages of meiosis I are the same as mitosis EXCEPT FOR metaphase I:<br />Metaphase I<br />Chromosomes line up beside each other instead of in a single line<br />For example:<br />Mitosis: - Meiosis:<br />
  5. 5. MEIOSIS I drawings<br />
  6. 6. Meiosis II<br />All stages of meiosis II are the same as mitosis EXCEPT FOR prophase II:<br />The chromosomes do not duplicate in prophase II: <br />
  7. 7. MEIOSIS II drawings<br />
  8. 8. What happens in the end?<br />Meiosis produces 4 sex cells with different genetic information than the parent cell<br />
  9. 9. Example problem:<br />Horses have a chromosome number of 66. How many chromosomes do their sex cells have?<br />Mango have a chromosome number of 40. How many chromosomes would its sex cells have?<br />Maize (corn) has 10 chromosomes in its sex cells. How many chromosomes does the “normal” cell have?<br />