Meiosis 1 - Meiosis Meiosis is the process in gametogenesis...

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Meiosis Meiosis  is the process in gametogenesis or sporogenesis during which one replication of the  chromosomes is followed by two nuclear divisions to produce four haploid cells. 3 Significant Events 1)       homologous chromosomes synapse and take on  tetrad configuration,  demonstrating that each chromosome has replicated 2)       chromatid arms within a tetrad overlap at one or more places forming  chiasmata (result from crossing over; genetic exchange) 3)       following crossing over, each tetrad divides, yielding two dyads Prophase l Leptonema -chromatin condenses -chromosomes become visible -chromomeres visible (localized condensations; appear as "beads on a string") Zygonema -chromosomes shorten and become thicker -zipper-like pairing (synaptonemal complex) of homologous chromosomes -number of threadlike chromosomes reduced by  Vz  because of pairing Pachynema
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This note was uploaded on 05/03/2008 for the course BIO 2322 taught by Professor Spotswood during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

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Meiosis 1 - Meiosis Meiosis is the process in gametogenesis...

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