chromosomes start to shorten and thicken up and become visable under a light microscope and the centrioles move to opposite poles of the cell and will form the spindel fibres
by the end of this phase the sister chromatids are joined at the centromere ( at the centre of the two lengths)
at the very end the nuclear membrane ( into lysosomes) and the nucleolus will dissappear so the chromosomes are free in the cytoplasm
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