What is chiasmata explain with neat diagram

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During prophase of meiosis the two homologous chromosomes are seen to be joined at several points along their length. These points are called chiasmata (chiasma, a cross). Each chiasma is the site of an exchange between chromatids. It is produced by breakage and reunion between any two of the four strands present at each site. As a result, genes  from one chromosome may swap with the genes from other chromosome leading new gene combination in the resulting chromatids.

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