Bivalents / tetrads are result of

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Compaction

Crossing over

Disjuction

Synapsis

answer is C.

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Detailed Solution

The pairing of homologous chromosomes is called synapsis. This occurs during the second stage of prophase I or zygotene . Bivalent(two chromosomes) or tetrad( four chromatids) is a pair of synapsed homologous chromosomes. They are formed during the zygotene stage of prophase I of meiosis.

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