differentiate zygotene and pachytene
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Pachytene is the third stage of the prophase of meiosis during which the homologous chromosomes become short and thick and divide into four distinct chromatids. ... Zygotene is the second stage of the prophase of meiosis, following leptotene, during which homologous chromosomes begin to pair.
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In heredity: During meiosis. At pachytene they pair, the corresponding portions of the two chromosomes lying side by side. The chromosomes then duplicate and contract into paired chromatids. At this stage the pair of chromosomes is known as a tetrad, as it consists of four chromatids.
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