During meiosis I, in which stage synapsis takes place?

Pachytene

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Zygotene

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Diplotene

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Leptotene

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Solution

The correct option is B Zygotene
The prophase I of meiosis I consists of the following phases:

Leptotene: Compaction of chromosomes.

Zygotene: Pairing of homologous chromosomes by the process of synapsis and formation of the synaptonemal complex.

Pachytene: Appearance of recombination nodules and crossing over between the non-sister chromatids of the homologous chromosomes, leading to recombination of genetic material.

Diplotene: Dissolution of the synaptonemal complex and formation of the X-shaped chiasmata.

Diakinesis: Terminalisation of chiasmata and condensation of chromosomes.

Hence, option b is correct.

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