A cytologist observes a meiotic cell in which the enzyme recombinase is highly active, facilitating the exchange of genetic material between non-sister chromatids. Identify the current stage of this cell and the defining event that will mark the beginning of the immediately following stage.

Step-by-step solution

The high activity of the enzyme recombinase and the active exchange of genetic material between non-sister chromatids indicate that the cell is currently in the pachytene stage of prophase I. The stage immediately following pachytene is diplotene. According to NCERT, the beginning of the diplotene stage is recognised by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes to separate, revealing X-shaped structures called chiasmata. Formation of the synaptonemal compl