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reproduction_meiosis_stages_events_key

reproduction_meiosis_stages_events_key - new...

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MEIOTIC STAGES and Their EVENTS Stage: Prophase I Events: ___Chromosomes condense. Spindle fibers form and centrioles move to opposite poles of cell. Nuclear envelope disappears. Homologous chromosomes pair up. Crossing over occurs between homologous chromosomes____________ Stage: Metaphase I Events: _Paired homologous chromosomes move to the equator of the cell. Spindle fibers are connected to each homologue’s centromere. Chiasma show where crossing over has occurred between homologous chromosomes_ STAGE: __Anaphase I___________ 3. Events: _Spindle fibers move the homologous chromosomes away from each other to opposite poles. The sister chromatids are attached. Each side of the cell has only 2 chromosomes instead of 4 4. STAGE: _Telophase I ___ Events:____Spindle fibers disappear. The nuclear envelope reappears briefly. The equator of the cell pinches in to create 2
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Unformatted text preview: new cells (Cytokinesis) Genome British Columbia, 2004 www.genomicseducation.ca 5. STAGE: ___Prophase II ___ Events: __Similar to mitosis : the nuclear envelop disappears. Spindle fibers form from centrioles that move to opposite ends of the cells. Chromosomes condense. STAGE: ___Metaphase II__________ 6. Events: ___Non-homologous chromosomes move to the equator forming a line. Spindle fibers are connected to each sister chromatid.________ STAGE: _____Anaphase II___________ 7. Events: __Spindle fibers pull and cause sister chromatids to separate and move to opposite poles of the cell(s)._______ STAGE: ___Telophase II_________ 8. Events: ___Chromatids (now chromosomes) at each pole lengthen and decondense. The cell membrane on each cell invaginates at the equator and creates 4 new cells with different genetic components but with 2 chromosomes each._________...
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