Chromonemata start associating into bivalent chromosomes during

Zygotene

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Leptotene

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Pachytene

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Diplotene

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Solution

The correct option is A Zygotene
Prophase I of meiosis I is comprised of leptotene, zygotene, pachytene, diplotene and diakinesis. During zygotene, homologous chromosomes join laterally in the process of synapsis to form bivalents, which are pairs of homologous chromosomes.

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During, meiosis-I, the bivalent chromosomes clearly appear as tetrads during:

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