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Meiosis I results in 2 haploid daughter cells
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Meiosis II Meiosis Each of the haploid daughter cells from meiosis I divide again to make 4 haploid cells.
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Comparing Mitosis and Meiosis
The processes of mitosis and meiosis are very similar, but with some important differences: Mitosis Includes only 1 cycle of cell division Occurs in body cells (somatic cells) No crossing over of chromosomes Results in two genetically identical diploid cells Metaphase: 1 duplicated chromosome per spindle fiber Meiosis Includes 2 cycles of cell division (meiosis I and meiosis II) Occurs only in sex cells (gametes) Chromosomes cross over in Prophase I Results in four genetically different haploid cells Metaphase I: 2 duplicated chromosomes per spindle fiber
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Interphase DNA replication occurs
DNA is in chromatin form (unwound, like spaghetti)
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Prophase I DNA condenses to form chromosomes
Homologous chromosomes pair up to form tetrads Crossing over takes place
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Metaphase I Homologous pairs line up along center of cell
1 homologous chromosome and its duplicate are attached to each spindle fiber
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Anaphase I Homologous pairs separate, move to opposite ends of the cell
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Telophase I Nuclear membrane reappears Spindle fibers disappear
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Cytokinesis Cytoplasm of the two cells separate
Meiosis I results in 2 haploid cells that are genetically different
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Prophase II The 2 haploid cells from Meiosis I will divide again
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Metaphase II Chromosomes (set of sister chromatids) line up along the center of the cell 1 sister chromatid attaches to each spindle fiber
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Anaphase II Centromeres split, sister chromatids are pulled apart
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Telophase II and Cytokinesis
Cytoplasm divides, resulting in 4 genetically different haploid cells
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