Question

Recombination between homologous chromosomes is completed by the end of

• A. Pachytene
• B. Leptotene
• C. Diplotene
• D. Zygotene

Answer 1

The correct option is A Pachytene

During the pachytene stage, bivalent chromosomes clearly appear as tetrads. This stage is characterised by the appearance of recombination nodules, the sites at which crossing over occurs between non-sister chromatids of the homologous chromosomes. Crossing over is the exchange of genetic material between two homologous chromosomes. Crossing over leads to recombination of genetic material on the two chromosomes. Recombination between homologous chromosomes is completed by the end of pachytene, leaving the chromosomes linked at the sites of crossing over.

So, the correct option is 'Pachytene'.