H111111H DNA duplexes pair HHHH 其中一一 所有模型 Homologous strands are nicked 11111111111H1 和假说都包 双链侵入模型 括切断、链 Broken strands exchange betveen duplexes 置换、连接 等过程 Crossover point m oves by branch migration H Second nicks made in same strand Second nicks made in other strand H 2 Second strands Nicks are sealed cross over between duplexes,and nicks are sealed Genomes are not recombinant, Reciprocal recombinant H11111H1H1 but contain heteroduplex region genomes are generated HHHHHHHH5‘ 5‘ （ 1 ） （ 2 ） 其中－－ 所有模型 和假说都包 括切断、链 置换、连接 等过程 双链侵入模型