The chromosomes start to condense and appear as two chromotids. The chromosomes of each homologus pair lie side by side to form bivalents. The chromatids of each pair become entwined and tension develops at these points called chiasmata. Enzymes may cut the DNA at these points and splicing them back onto the chromatid, this is genetic crossing over. Chiasmata hold the chromosomes together as the drift apart.
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