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The sister chromatids separate after homologous chromosomes because the chromatids are directly conected whereas the homologous chromosomes are not. Crossing over is the process of two non-sister chromatids swapping information.
In contrast, two homologous chromosomes usually do not have identical alleles at all loci. They are inherited from different parents and therefore are not derived from the same DNA molecule. The two chromatids of each sister chromatid pair are segregated into separate cells in both mitosis and meiosis. But they remain together throughout the first division during meiosis (meiosis I). It is only during the second meiotic division (during anaphase II) that they finally separate.