breakage and reunion In genetics, the established model of crossing-over by the physical breakage and crosswise reunion of broken chromatids during the pairing of homologous chromosomes at the prophase I stage of meiosis. The points at which chromosomes cross over are termed chiasmata. The result of crossing-over is the mutual exchange between chromatids of parts which contain corresponding loci.

breakage and reunion In genetics, the established model of crossing-over by the physical breakage and crosswise reunion of broken chromatids during the pairing of homologous chromosomes at the prophase stage of meiosis. The points at which chromosomes cross over are termed chiasmata. The result of crossing-over is the mutual exchange between chromatids of parts which contain corresponding loci.