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mitosis meiosis


             Mitosis evolved in complex plants and animals for growth and repair. Mitosis, the
             division of a cell resulting in two identical daughter cells, prolongs an organism's life by
             replacing old, dead, and damaged cells. In complex animals and plants, mitosis occurs
             Meiosis evolved in complex plants and animals to increase variation in offspring
             and to maintain the number of chromosomes from generation to generation. Meiosis
             occurs in the sex cells of organisms, specifically the ovaries and testes in animals, and in
             In an organism where n=8, the process of mitosis would be the following: In
             interphase, the DNA would replicate, resulting in 16 chromosomes. In prophase, two
             centrioles would move to the poles, the spindle starts to form, the nucleolus and nuclear
             membrane disappear, and the kinetochore fibers attach to the chinetochores. During
             metaphase, the chromosomes line up at the equator. In anaphase, the centromere splits,
             and the chromosomes move to the opposite poles (8 to each pole), pulled by the
             kinetochore fibers on the spindle. Lastly, during telophase, the spindle disappears, the
             nucleolus and nuclear membrane reappear, and the cell separates resulting in two new
             cells, exactly like the parent cell, each with 8 chromosomes.
             Meiosis in an organism where n=8 would be the following: During interphase I,
             the 16 chromosomes (2n=16) replicate to 32 chromosomes. In prophase I, centrioles
             would move to the poles, the spindle starts to form, the nucleolus and nuclear membrane
             disappear, and the kinetochore fibers attach to the chinetochores. Most importantly, the
             pairing of homologous chromosomes and crossing over takes place. This step is very
             important in creating variation among offspring. Next, the homologous pairs line up at
             the equator in metaphase I. In anaphase I, the homologues, each consisting of two sister
            

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