Diplotene Stage & Synaptonemal Complex — NEET Biology
✅ Asked in NEET 2024The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate from each other except at the sites of crossovers. These X-shaped structures, are called chiasmata. In oocytes of some vertebrates, diplotene can last for months or years.
Diplotene is the stage where the synaptonemal complex dissolves and homologous chromosomes begin to separate, remaining connected only at crossover points called chiasmata. NTA tests this because students often confuse diplotene with other meiotic prophase stages or forget that chiasmata are the physical evidence of recombination. The common mistake is thinking chromosomes separate completely in diplotene—they don't; they stay attached at crossover sites. Remember: Synaptonemal complex dissolution = start of diplotene, chiasmata = where recombined homologs still hold together, and diplotene can be extremely long in oocytes (months to years).
This paragraph was tested 5 times in NEET.
Given below are two statements: Statement I: Chromosomes become gradually visible under light microscope during leptotene stage. Statement II: The beginning of diplotene stage is recognized by dissolution of synaptonemal complex.[Neet 2024] Choose the correct answer from the options given below:
The dissolution of synaptonemal complex occurs during:
Which stage of meiosis can last for months or years in the oocytes of some vertebrates?
The stage during which separation of the paired homologous chromosomes begins is:
Dissolution of the synaptonemal complex occurs during:
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