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A full set of sister chromatids is created during the S subphase of interphase, when all the DNA in a cell is replicated. Identical chromosome pairs are separated into two different cells during mitosis, or cellular division.
In this example, meiosis does not generate germ cells with A and A or B and B, rather it produces cells with A and B, or A and B, or A and B, or A and B. The homologous chromosomes, each consisting of two sister chromatids, are paired during the first phase of meiosis, e.g., A with A and B with B (Fig.