a B DE F G H O Overlap of B homologues A B C DE F G H O Simultaneous O break A DE F G H O Reunion of A B C B C D E F G H homologuesA B C D E F G H B C A A B C D E F G H B C A A D E F G H A B C B C D E F G H Overlap of homologues Simultaneous break Reunion of homologues