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During which stage does crossing over occur with the help of the recombinase enzyme?

1. Pachytene - Crossing over occurs with the assistance of the recombinase enzyme.
2. Zygotene - Homologous chromosomes align and pair up.
3. G2 phase - RNA and protein are synthesized.
4. Anaphase I - Chromatids move to opposite poles without centromere separation.

Correct answer: Pachytene - Crossing over occurs with the assistance of the recombinase enzyme.

Solution

During the pachytene stage of prophase I in meiosis, crossing over occurs, which is facilitated by the recombinase enzyme. This is a key event for genetic recombination.

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