Concept 13.3

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“Meiosis reduces the number of chromosome sets from diploid to haploid” …

“Meiosis reduces the number of chromosome sets from diploid to haploid”

oh wait this isn't the one we presented, but at least it still has all of the basic information.

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  • 1. Concept 13.3: “Meiosis reduces the number of chromosome sets from diploid to haploid” Michelle Ko Austin Vong Benjamin Huang Rex Ledesma
  • 2. The Stages of Meiosis
    • Preceded by chromosome replication
    • 2 cell divisions: meiosis I and meiosis II
    • Result = 4 daughter cells with half the number of chromosomes as parent cell
  • 3. Meiosis II: Separating Sister Chromatids
    • Begins with haploid cell
    • Produces 4 haploid daughter cells
  • 4. Prophase II
    • Spindle apparatus
    • Chromosomes with 2 chromatids
    • Start to move towards metaphase plate
  • 5. Metaphase II
    • Chromosomes on metaphase plate
    • 2 sister chromatids are not genetically identical
    • Kinetochores attached to microtubules
  • 6. Anaphase II
    • Centromeres separate
    • Sister chromatids come apart
    • Move towards opposite poles as 2 individual chromosomes
  • 7. Telophase II and Cytokinesis
    • Nuclei form
    • Chromosomes condense
    • Cytokinesis
  • 8. Animation
    • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter28/animation__stages_of_meiosis.html
  • 9. Summary
    • Meiosis 1 halves chromosome set numbers, meiosis 2 separates sister chromatids to haploid daughter cells
    • Meiosis produces 4 haploid daughter cells that are genetically different from each other and parent. (whereas mitosis produces 2 identical diploid cells)
    • 3 events unique to meiosis:
      • Synapsis & Crossing over
      • Tetrads on the metaphase plate
      • Separation of homologues