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Question
Dissolution of the synaptonemal complex occurs during which of the following stages?
Dissolution of the synaptonemal complex occurs during which of the following stages?
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Solution
The correct option is A Diplotene
The prophase stage of meiosis I (or prophase I) is divided into five stages which include leptotene, zygotene, pachytene, diplotene and diakinesis.
- Leptotene is characterised by gradual condensation of chromosomes.
- Zygotene is characterised by the pairing of homologous chromosomes, called synapsis, accompanied with formation of the synaptonemal complex.
- Pachytene is the stage in which exchange of segments of non-sister chromatids of homologous chromosomes occurs.
- Diplotene is characterised by the dissolution of the synaptonemal complex. The recombined homologous chromosomes start separating except at the crossover sites giving rise to X-shaped structures called chiasmata.
- Diakinesis is marked by the terminalisation of chiasmata. Nuclear membrane and nucleolus completely disappear by the end of this phase.
The prophase stage of meiosis I (or prophase I) is divided into five stages which include leptotene, zygotene, pachytene, diplotene and diakinesis.
- Leptotene is characterised by gradual condensation of chromosomes.
- Zygotene is characterised by the pairing of homologous chromosomes, called synapsis, accompanied with formation of the synaptonemal complex.
- Pachytene is the stage in which exchange of segments of non-sister chromatids of homologous chromosomes occurs.
- Diplotene is characterised by the dissolution of the synaptonemal complex. The recombined homologous chromosomes start separating except at the crossover sites giving rise to X-shaped structures called chiasmata.
- Diakinesis is marked by the terminalisation of chiasmata. Nuclear membrane and nucleolus completely disappear by the end of this phase.
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