Mitosis and Meiosis Essay -- essays research papers

Cell division may happen by either mitosis or meiosis, depending on what type of cell is invovled. Mitosis is a transit by which a cell divides to form cardinal daughter cells. They all(prenominal) have the same exact number and kind of chromosomes as the enhance cell. Meiosis occurs in the primary sex cells leading to the formation of possible egg and sperm cells. They reduce the number of chromosomes to half in to each one gamete so that when they are getting furtilized, the species chromosome number is kept even. Mitosis happens in the counter of unicellular pipe organisms and in the addition of cells to a tissue or organ in a multicellular organism.There are four stages of mitosis. The offset printing stage is the prophase. In this stage the chromosomes become shorter and thicker and they each consist of two chromatids. The nuclear membrane drives to disintegrate. The centrioles in animal cells, fungi, algae and some an opposite(prenominal) ferns double and a pair move toward each pole and the chromosomes begin to move toward the equator of the cell.The second stage is called the metaphase. In this stage the centrioles move to the poles. The chromosomes cable length up at the equator of the spindle and the spindle fibers are attached to the centromeres connecting them to the poles of the spindle.The troika stage is called the anaphase. By this time, the centromeres split apart. The chromatid pairs of each chromosome separate from each other and they move quickly in opposite directions, one toward each pole.The uttermost(a) stage is cal...