In oocytes of some vertebrates, a specific stage of meiosis I can last for months or years. Identify this arrested stage and the specific structure that holds the homologous chromosomes together during this prolonged phase.

Step-by-step solution

According to NCERT, in oocytes of some vertebrates, the diplotene stage can last for months or years. During the beginning of diplotene, the synaptonemal complex dissolves. The recombined homologous chromosomes of the bivalents tend to separate from each other except at the sites of crossing over. These X-shaped structures where the chromosomes remain physically attached are called chiasmata. Therefore, during this prolonged arrested phase, it is the chiasmata that hold the homologous chromosomes together, not the