Identify the diagram and name the stage of meiosis correctly.

Pachytene (crossing over)

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Zygotene

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Leptotene

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Diplotene

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Solution

The correct option is A Pachytene (crossing over)
After completion of synapsis (pairing of homologous chromosomes), the cell enters the pachytene stage.

During pachytene of meiosis-I, the paired chromosomes of each bivalent condense and become more distinct. Further, sister chromatids in each chromosome become distinct due to the appearance of a longitudinal furrow. Thus, each bivalent clearly appears as a tetrad consisting of four chromatids. Exchange of chromatid segments between non-sister chromatids of each tetrad occurs at this stage, as is seen in the diagram. This process is known as crossing over. The point of interchange and rejoining appears X shaped and is known as chiasma.

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