Which stage of meiosis can last for months or years in the oocytes of some vertebrates? (NEET 2022-R) 
 

The oocytes of some vertebrates get arrested for years or months in diplotene stage of meiosis prophase I. 
(1) The first stage of prophase I called leptotene.
(2) During pachytene stage, crossing over between the non-sister chromatids of homologous chromosomes takes place.
(4) Diakinesis is characterised by terminalisation of chiasmata.