Notes 9-15-08

Notes 9-15-08 - 9/15/08 Mitosis Prophase Chromosomes...

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9/15/08 Mitosis Prophase Chromosomes condense Nuclear membrane begins to break down Microtubules become visible Metaphase Chromosomes line up across center of the cell Spindle fibers attach to centromeres Anaphase Spindle fibers pull apart sister chromatids to either side of cell Telophase “backwards prophase” Spindle fibers dissapear Nuclear membrane reforms Chromosomes decondense Meiosis Two cellular divisions instead of one During first meiotic division homologous chromosomes are separated instead of sister chromatids (in mitosis) o Crossing over also occurs in prophase I In second meiotic division sister chromatids are separated resulting in eight
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