Chapter 8: Mitosis - Cell Division and Reproduction
Chapter 8: Mitosis - Cell Division and Reproduction
Chapter 8: Mitosis - Cell Division and Reproduction
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Meiosis I: Separation of Homologous Chromosomes<br />
1. Prophase I:<br />
Most complex phase of meiosis (90% of time)<br />
Chromatin condenses into chromosomes.<br />
Nuclear membrane <strong>and</strong> nucleoli disappear.<br />
Centrosomes move to opposite poles of cell <strong>and</strong><br />
microtubules attach to chromatids.<br />
Synapsis: Homologous chromosomes pair up<br />
<strong>and</strong> form a tetrad of 4 sister chromatids.<br />
Crossing over: DNA is exchanged between<br />
homologous chromosomes, resulting in genetic<br />
recombination. Unique to meiosis.<br />
Chiasmata: Sites of DNA exchange.
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