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Chromosomal Crossover
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Non-sister Chromatids

These are chromatids of homologous chromosomes. While sister chromatids are exact copies of each other, non-sister chromatids code for the same genes but are not genetically identical.

Chiasma

Chiasma is the point of contact between two non-sister chromatids to exchange DNA, also called crossing over. It occurs during meiosis and produces a new combination of genes.