Concept 13.3
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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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    Concept 13.3 Concept 13.3 Presentation Transcript

    • Concept 13.3: “Meiosis reduces the number of chromosome sets from diploid to haploid” Michelle Ko Austin Vong Benjamin Huang Rex Ledesma
    • 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
    • Meiosis II: Separating Sister Chromatids
      • Begins with haploid cell
      • Produces 4 haploid daughter cells
    • Prophase II
      • Spindle apparatus
      • Chromosomes with 2 chromatids
      • Start to move towards metaphase plate
    • Metaphase II
      • Chromosomes on metaphase plate
      • 2 sister chromatids are not genetically identical
      • Kinetochores attached to microtubules
    • Anaphase II
      • Centromeres separate
      • Sister chromatids come apart
      • Move towards opposite poles as 2 individual chromosomes
    • Telophase II and Cytokinesis
      • Nuclei form
      • Chromosomes condense
      • Cytokinesis
    • Animation
      • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter28/animation__stages_of_meiosis.html
    • 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