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Name the stage of cell cycle at which one of the following events occur.

1. Chromosomes are moved to spindle equator.

2. Centromere splits and chromatids separate.

3. Pairing between homologous chromosomes takes place.

4. Crossing over between homologous chromosomes takes place.

Answer
1. Metaphase of mitosis.
2. Anaphase of mitosis.
3. Zygotene stage of meiosis I. 
4. Pachytene stage of meiosis I.