Prophase - the nuclear envelope disappears and replicated chromosomes coil into X shaped chromosomes.
Metaphase - the tugging of the spindle fibres pulls the chromosomes into a single line across the middle of the cell.
Anaphase - the spindle fibres begin to contract and shorten. This action pulls the centromere apart, allowing the sister chromatids to move to opposite pole of the cell. Once they separate, each sister chromatin is considered a chromosome.
Telophase - final stage of mitosis. One complete set of chromosomes stand at each pole of the cell. The spindle fibres begin to disappear, and a nuclear membrane forms around each chromosome. Now there are two nuclei on one cell. The cell is ready to divide.
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