1. MEIOSIS! Thurs., Sept. 30, 2010

2. STAGES OF MEIOSIS: MEIOSIS I Prophase I Metaphase I Anaphase I Telophase I MEIOSIS II 5. Prophase II 6. Metaphase II 7. Anaphase II 8. Telophase II

4. Meiosis I All stages of meiosis I are the same as mitosis EXCEPT FOR metaphase I: Metaphase I Chromosomes line up beside each other instead of in a single line For example: Mitosis: - Meiosis:

5. MEIOSIS I drawings

6. Meiosis II All stages of meiosis II are the same as mitosis EXCEPT FOR prophase II: The chromosomes do not duplicate in prophase II:

7. MEIOSIS II drawings

8. What happens in the end? Meiosis produces 4 sex cells with different genetic information than the parent cell

9. Example problem: Horses have a chromosome number of 66. How many chromosomes do their sex cells have? Mango have a chromosome number of 40. How many chromosomes would its sex cells have? Maize (corn) has 10 chromosomes in its sex cells. How many chromosomes does the “normal” cell have?