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Overview of mitosis: During the course of the cell cycle interphase and mitosis alternate. During interphase the chromosomes replicate and the cell prepares for mitosis, which is the process of cell division in which one cell becomes two genetically identical daughter cells. During interphase the chromosomes exist as thin, unpacked threads invisible under a light microscope.
The animation above illustrates the different phases of mitosis in a plant cell. The following changes occur in the different phases of mitosis. Prophase. In prophase, changes occur in both the cytoplasm and nucleus of the dividing cell. The chromatin condenses into discrete chromosomes. The chromosomes begin to migrate toward the cell center. The nuclear envelope breaks down and spindles form at opposite poles of the cell. In animal cells, the mitotic spindle initially appears as structures called asters which surround each centriole pair.