mitosis meiosis

            Mitosis evolved in complex plants and animals for growth and repair.
             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.
             everywhere, except sex cells. .
             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.
             the pollen and ovules of plants.
             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.
             chomatids separate, however the sister chromatids do not separate.