Tetrad formation occurs in phase of prophase I of meiosis I.

leptotene

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zygotene

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pachytene

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diplotene

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Solution

The correct option is B zygotene
During zygotene, homologous chromosomes form tetrads by the process of synapsis (pairing of homologous chromosomes). Formation of synaptonemal complex is also seen during this stage.

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