Abstract
The replication bypass model for sister chromatid exchange (SCE) proposed by Shafer is examined in detail. When applied through two cell cycles, the model predicts that potentially observable SCEs induced during one S phase will then be cancelled and rendered undetectable during the subsequent S phase. This aspect of replication bypass is inconsistent with the observation of twin SCEs in tetraploid cells. Furthermore, the model cannot account for the efficient induction of SCEs by non-cross-linking chemical agents.
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