Mitosis , process of nuclear division in a living cell by which the carriers of hereditary information, or the chromosomes, are exactly replicated and the two copies distributed to identical daughter nuclei. Mitosis is accompanied by cell division (cytokinesis). Each cell formed receives chromosomes that are alike in composition and equal in number to the chromosomes of the parent cell.
PMAT Stages Mitosis is simply described as having four stages—prophase, metaphase, anaphase, and telophase; the steps follow one another without interruption.
At some point before prophase begins, the chromosomes dupicate themselves to form pairs of identical sister chromosomes.
During prophase the two chromatids remain attached to one another at a region called the centromere, the nuclear envelope breaks down and disappear. The spindle begins to form. In animal cells the centrioles separate and move apart.. The pair will begin to line up.
During metaphase The equatorial plane marks the point where the whole cell will divide when nuclear division is completed.
During anaphase the two chromatids of each chromosome separate and move to opposite poles, pulled along the spindle fibers by the centromeres.
During telophase new nuclear envelopes form around the two groups of daughter chromosomes, the new nucleoli begin to appear, and eventually, as the formation of the two daughter nuclei is completed, the spindle fibers disappear.
Cytokinesis finally separates the daughter nuclei into two new individual daughter cells.