Why Does Pachytene Occurs?

Pachytene encompasses pairing of chromosomes and recombination and repair of DNA, suggesting that p53 controls some aspects of the meiotic cycle to permit DNA shuffling and repair.

What occurs during pachytene?

During pachytene, each tetrad shortens, thickens, and separates into four distinct chromatids joined at the centromere. This is also the stage of homologous recombination, e.g. chromosomal crossover between nonsister chromatids. In sites where genetic exchanges occurred, chiasmata form.

What major genetic process occurs in pachytene?

During pachytene the homologous chromosomes thicken and become recombinant. Crossing over of segments of genetic information occurs between non-sister chromatids of homologous chromosomes, forming exchange sites called chiasmata and resulting in recombination.