Why recombination occurs

We suggest that these events occur by a conventional homologous recombination mechanism. References. Ahn B.Y.; Dornfeld K.J.; Fagrelius T.J.; Livingston D. 25 thg 9, Recombination can occur between two different DNA molecules (intermolecular recombination) or between two regions of a single DNA molecule . Recombination. Natural selection is usually the most powerful mechanism or process causing evolution to occur, however, it only selects among the existing.