[Unequal crossing over as the pathway of adaptive homologous recombination between the direct DNA repeats in tandem duplications of Escherichia coli].

Abstract excerpt

Homologous recombination between direct DNA repeats within the extended tandem duplications in E. coli results from unequal sister-chromosome exchanges. This conclusion follows from the observations on the segregation of completely or partly homozygous diploid segregants by heterozygous duplications. The formation of diploid segregants with preserved heterozygosity for the unselected markers could also result...

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