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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.
The sister chromatids are connected to each other at a point called the centromere. During mitosis, the nuclear envelope dissolves, and sister chromatids separate at the centromere, becoming two individual daughter chromosomes, each now with only one chromatid.