Genomics of parallel adaptation at two timescales in Drosophila.

We observed a very weak but highly significant correlation in synonymous heterozygosity between species (Pearson’s r = 0.14, p<2.2e-16), consistent with some degree of conservation for genic parameters of mutation rates and/or selection at Drosophila synonymous sites [ 58 , 70 – 74 ].

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melanogaster showed a marginally significant bias (94 nsSNPs with higher frequency in Maine and 71 with higher frequency in Panama, χ 2 test, p = 0.05).

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