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Bio3 0910 Lec4 Meiosis
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Bio3 0910 Lec4 Meiosis

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  • 1. Meiosis
    Biology 3 Kawashima
    Philippine Science High School
    SY 2009-2010
  • 2.
  • 3.
  • 4. Homologous chromosomes condense at prophase I
    Homologous chromosomes pair along their lengths, aligned gene by gene
    Synaptonemal complex forms between homologues, holding them together along their lengths
  • 5. Homologous chromosomes condense at prophase I
    Synaptonemal complex disassembles in late prophase I, and each chromosome pair become visible as a tetrad
    A tetrad is a group of four chromotids
    Each tetrad has one or more chiasmata, cris-crossed regions where crossing-over has occured
  • 6. Tetrads align on the metaphase plate at metaphase I
    Chiasmata are still intact
    One chromosome of each pair face the pole
    Chromatids of homologous chromosomes are attached to kinetochore microtubules from one pole
  • 7. Homologous chromosomes separate at anaphase I
    Sister chromatids remain attached at the centromere
    Sister chromatids move towards the same pole
    Homologous chromosomes, each composed of two sister chromatids, move to opposite poles
  • 8. Each half has a complete haploid set of chromosomes at telophase I
    Each chromosome is still composed of two sister chromatids
    Cytokenesis begins to form two daughter cells, each with a haploid set of chromosomes
    No chromosome doubling occurs between telophase I and prophase II, as they have already been replicated
  • 9. Meiosis I
    Homologous chromosomes condense at prophase I
    Tetrads align on the metaphase plate at metaphase I
    Homologous chromosomes separate at anaphase I
    Each half has a complete haploid set of chromosomes at telophase I