23 - Bio 102 Meiosis - Reduction Division 2N 1N 1/23/2008...

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Bio 102 23/01/2008 10:14:00 Meiosis - Reduction Division 2N    1N   a) Independent assortment – Enormous variety of genotypes b) Recombination – crossing over Interphase (drawing) Sister chromatids Homologous chromosomes Sisters stay together Meiosis I (drawing) Meiosis II (drawing) Remember  PMAT Interphase:  DNA duplication Homologous chromosomes come together Sister chromatids – 4 “Bivalent” Prophase I: Chromosomes begin to condense Paired together Synapses Line up together and held together Crossing over takes place Metaphase: Chromosomes line up at interphase plate o Do so at random; random orientation
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Anaphase I: Homologous chromosomes separate Telophase I: Gather chromosomes into nucleus Cell divides Cytoknysis Prophase II: Condense Metaphase II: Spindle forms Chromosomes lineup on metaphase plate
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23 - Bio 102 Meiosis - Reduction Division 2N 1N 1/23/2008...

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