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Transcript
The purpose of meiosis is to produce gametes and genetic variation. After meiosis, there are four haploids, each with different sets of chromosomes. This increases the genetic variation which allows for evolution and the adaptation of organisms to different environments and for sexual reproduction to occur. Chromatin condenses into chromosomes Prophase I Chromatin condenses into chromosomes Prophase I Chromatin condenses into chromosomes Prophase I Prophase I Centrosomes move to opposite sides of the cell and form the mitotic spindle. Prophase I Centrosomes move to opposite sides of the cell and form the mitotic spindle. Prophase I Homologous chromosomes exchange genetic information by crossing-over. Prophase I Homologous chromosomes exchange genetic information by crossing-over. Metaphase I Chromosome pairs align in the middle of the cell. Metaphase I Chromosome pairs align in the middle of the cell. Metaphase l Chromosomes from each pair are pulled to opposite sides of the cell by spindle fibers. Anaphase l Chromosomes from each pair are pulled to opposite sides of the cell by spindle fibers. Anaphase l Chromosomes from each pair are pulled to opposite sides of the cell by spindle fibers. Anaphase l Chromosomes decondense and cytoplasm divides by cytokinesis Telophase l Chromosomes decondense and cytoplasm divides by cytokinesis Telophase l Chromosomes decondense and cytoplasm divides by cytokinesis Telophase l Chromosomes condense. There are now only a haploid number of chromosomes per cell. Prophase ll Chromosomes condense. There are now only a haploid number of chromosomes per cell. Prophase ll Chromosomes condense. There are now only a haploid number of chromosomes per cell. Prophase ll Chromosomes align in the middle of the cell. Prophase ll Chromosomes align in the middle of the cell. Spindle fibers attach to them. Metaphase ll Spindle fibers pull the chromosomes to opposite poles of the cell. Anaphase ll Spindle fibers pull the chromosomes to opposite poles of the cell. Anaphase ll Spindle fibers pull the chromosomes to opposite poles of the cell. Anaphase ll Chromosomes decondense and cytoplasm divides by cytokinesis. The result is 4 haploid cells. Telophase ll Chromosomes decondense and cytoplasm divides by cytokinesis. The result is 4 haploid cells. Telophase ll Chromosomes decondense and cytoplasm divides by cytokinesis. The result is 4 haploid cells. Telophase ll