Question

Recombination between homologous chromosomes is completed by the end of

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

Answer 1

The Correct Option is D

Recombination between homologous chromosomes is completed by the end of pachytene

Answer 2

Recombination is completed by the end of pachytene. 

Meiosis I occur during the gamete formation, the phases of meiosis I is as follows: 

1. Leptotene: during this phase the chromosome will condense and thus become visible. There will be pairing of the homologous chromosome. 
2. Zygotene: there will be formation of synaptonemal complexes, it is the region where crossing over takes place. 
3. Pachytene: during this phase the crossing over is completed. But the homologous chromosomes remain attached to each other at the point of chiasmata. 
4. Diplotene: the complex will start dissolving and the homologous chromosome will start separating, this will make the chiasmata visible. 
5. Diakinesis: there will be condensation of the chromosomes and the nuclear envelope will break down. This will start the preparation of metaphase I