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Which sequence correctly represents the order of events during prophase I of meiosis?

1. Formation of synapsis → Occurrence of crossing over → Chiasmata resolution → Nucleolus fades away.
2. Formation of synapsis → Nucleolus fades away → Occurrence of crossing over → Chiasmata resolution.
3. Occurrence of crossing over → Formation of synapsis → Chiasmata resolution → Nucleolus fades away.
4. Chiasmata resolution → Formation of synapsis → Occurrence of crossing over → Nucleolus fades away.

Correct answer: Formation of synapsis → Occurrence of crossing over → Chiasmata resolution → Nucleolus fades away.

Solution

The correct sequence follows the progression of prophase I events: homologous chromosomes undergo synapsis, crossing over occurs between non-sister chromatids, chiasmata are then formed/resolved as the homologs begin to separate, and late prophase changes like nucleolus disappearance occur. This matches option A.

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