Abstract
In this study, we set out to determine whether the mutation frequency in cell hybrids is increased over the frequencies in the two parental lines, and whether this increase is related to the evolutionary divergence of the cell parents. Two test loci were chosen: forward mutation at the HPRT locus and mutation to resistance to the drug emetine. We conclude that while some cell combinations do seem to produce hybrids with higher mutation frequencies, this is not consistently so, and, indeed, mutation rates in hybrids may be higher, lower or very similar to rates in the parental lines. Further, evolutionary divergence between the parental lines does not appear to correlate to mutation frequency in the hybrids.
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