Concept 13.3

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“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

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

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