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Dissolution of the synaptonemal complex occurs during:
The synaptonemal complex is formed during Zygotene (synapsis) and maintained during Pachytene (crossing over). The beginning of DIPLOTENE is explicitly recognized by the DISSOLUTION OF THE SYNAPTONEMAL COMPLEX! Mark Diplotene (Option 3) in 5 seconds.
Prophase I of meiosis is subdivided into five successive stages based on chromosomal behavior: Leptotene, Zygotene, Pachytene, Diplotene, and Diakinesis.
NCERT states verbatim: "The 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 remaining X-shaped crossover connection structures are called chiasmata, which become prominently visible in diplotene precisely because the synaptonemal complex has dissolved elsewhere along the chromosome arms.
In Leptotene chromosomes condense; in Zygotene synaptonemal complex forms; in Pachytene crossing over occurs; in Diakinesis chiasmata terminalize. Thus, dissolution uniquely marks Diplotene.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect; in Pachytene the synaptonemal complex is intact and active, facilitating crossing over between non-sister chromatids.
Incorrect; in Zygotene the synaptonemal complex is ASSEMBLED (formed), not dissolved.
Factually exact; NCERT defines the beginning of diplotene by the dissolution of the synaptonemal complex.
Incorrect; Leptotene is the initial stage where chromatin condenses; the complex has not yet even formed.
Zygotene: FORMATION of synaptonemal complex. Pachytene: CROSSING OVER occurs within complex. Diplotene: DISSOLUTION of synaptonemal complex.
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