Abstract
Unequal crossing over between direct DNA repeats of sister chromosomes occurs during DNA replication in Escherichia coli. Such exchanges yield tandem duplications and thereby increase the expression of the genes involved. Nonhomologous cohesion of sister chromosomes and unequal crossing over were assumed to take place when the replication fork stops. When the replication forks moves continuously, homologous exchanges between sister chromosomes ensure their postreplication repair.
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