 During mitosis , the major homologous recombination pathway for repairing DNA double @-@ strand breaks appears to be the SDSA pathway ( rather than the DSBR pathway ) . The SDSA pathway produces non @-@ crossover recombinants ( Figure 4 ) . During meiosis non @-@ crossover recombinants also occur frequently and these appear to arise mainly by the SDSA pathway as well . Non @-@ crossover recombination events occurring during meiosis likely reflect instances of repair of DNA double @-@ strand damages or other types of DNA damages . 
