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![]() ![]() When this process is completed, the cell is in G2 phase (the two sister chromatids are held together by cohesion complexes, yellow). During S phase (DNA synthesis), every DNA molecule is replicated. Each chromosome contains a single double-stranded DNA molecule. The nucleus of each cell contains two copies of each chromosome (‘diploidy’): one from mother (red) and one from father (blue). At the bottom-left of the diagram cell division gives rise to two small daughter cells.
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