Question

Is crossing over an enzyme-mediated process?

Answer 1

Crossing over:

1. Crossing over takes place during pachytene of prophase 1 of meiosis 1.
2. The sites at which crossing over occurs are called recombination nodules.
3. It involves the exchange of DNA segments in non-sister chromatids of homologous chromosomes.
4. This is done by breaking and reuniting the chromatid segments.
5. This process is mediated by a multienzyme complex called recombinase.
6. It leads to the recombination of genetic material on the two chromosomes.