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Crossing over is a fundamental genetic process that occurs during meiosis, specifically in prophase I of meiosis I, where homologous chromosomes pair up and exchange segments of their chromatids. This exchange of genetic material between non-sister chromatids leads to new combinations of alleles, contributing to genetic variation _______ ________ ___ _______ __________ _____ ____ __________ _________ _______ _________ ________.
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