Meiosis<br />Biology 3 Kawashima<br />Philippine Science High School<br />SY 2009-2010<br />
Homologous chromosomes condense at prophase I<br />Homologous chromosomes pair along their lengths, aligned gene by gene<b...
Homologous chromosomes condense at prophase I<br />Synaptonemal complex disassembles in late prophase I, and each chromoso...
Tetrads align on the metaphase plate at metaphase I<br />Chiasmata are still intact<br />One chromosome of each pair face ...
Homologous chromosomes separate at anaphase I<br />Sister chromatids remain attached at the centromere<br />Sister chromat...
Each half has a complete haploid set of chromosomes at  telophase I<br />Each chromosome is still composed of two sister c...
Meiosis I<br />Homologous chromosomes condense at prophase I<br />Tetrads align on the metaphase plate at metaphase I<br /...
Bio3 0910 Lec4 Meiosis
Bio3 0910 Lec4 Meiosis
Bio3 0910 Lec4 Meiosis
Bio3 0910 Lec4 Meiosis
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Bio3 0910 Lec4 Meiosis

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Bio3 0910 Lec4 Meiosis

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