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What are two important events of prophase?

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The chromatid threads begin to twist and condense, creating chromosomal structures which are visible to the microscope. Each chromosome then seeks out its homologous chromosome. After the homologous chromosomes pair, the structure is referred to as a tetrad. The point at which two non-sister chromatids intertwine is known as a chiasma. Sometimes a process known as crossing over occurs at this point.
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