Meiosis lesson

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Meiosis lesson

  1. 1. Producing Haploid Daughter cells MEIOSIS
  2. 2. OBJECTIVES 1. Define Meiosis. 2. Enumerate the stages of Meiosis. 3. Give the significance of Meiosis in Sexual Reproduction.
  3. 3. Meiosis - Consists of two successive divisions of the nucleus called meiosis I and meiosis II - Results in four haploid daughter cells - Only happens in the sex gonads ( testes and ovary)
  4. 4. Stages of Meiosis First Meiotic Division • Prophase I • Metaphase I • Anaphase I • Telophase I Second Meiotic Division • Prophase II • Metaphase II • Anaphase II • Telophase II
  5. 5. Events for First Meiotic Division • Prophase I- chromosome becomes visible and the nuclear membrane disappears; homologous chromosome appears and share fragments called crossing over
  6. 6. Metaphase I- complete disappearance of nuclear membrane and appearance of spindle fiber; centromeres attached to the spindle fiber and lies on the metaphase plate or central plate
  7. 7. Anaphase I- homologous chromosome separates from each other but centromere do not divide; chromosome continues to consists of two chromatids
  8. 8. Telophase I- chromosomes are still doubled; nuclear membrane is formed and disappearance of spindle fiber
  9. 9. Second Meiotic Division Prophase II- cells have one chromosome
  10. 10. Metaphase II- chromosomes align at the metaphase plate; centromeres divide thus separating the chromatids
  11. 11. Anaphase II- each new daughter cell move towards opposite poles
  12. 12. Telophase II- spindle disappears; nuclear membrane is formed; nuclei are formed and cytokinesis happens
  13. 13. Gametogenesis - a process of producing sex cells • Spermatogenesis- sperm production; occurs during puberty stage and continues throughout life • Oogenesis- production of female gametes or ova
  14. 14. Oogenesis
  15. 15. Seatwork Answer Activity Sheet on “ Inferring Difference” E:Seatwork #3 in meiosis.docx
  16. 16. Assignment #4 • Answer activity sheet on Sexual reproduction in lower forms of life and animals

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