[dekhn]

Can you say that for certain in this case? In particular, any time you sequence a population, you see a large number of "novel" SNPs (or collections of SNPs), where the mutations were introduced in the germline of the parent and inherited, but weren't present in the parent's somatic cell line. And that's exactly what they saw in this paper. So I'm not certain you can claim that the DNA didn't adjust (rather, that natural mutations didn't contribute to the survivor's higher reproduction rate).