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Choose the correct option for the following events of meiosis in correct sequence: (A) Crossing over (B) Synapsis (C) Terminalisation of chiasmata (D) Disappearance of nucleolus

1. B → A → C → D
2. A → B → C → D
3. A → B → D → C
4. D → C → B → A

Correct answer: B → A → C → D

Solution

Synapsis happens first when homologous chromosomes pair in zygotene. Crossing over follows in pachytene, terminalisation of chiasmata occurs later, and disappearance of the nucleolus is a late prophase I event.

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