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Clinal genetic variation with latitude. (a, b): Allele frequency trajectories for clinal SNPs (P < 0.01, sample of 100). Allele frequencies are polarized such that FL < ME. (c) Distribution of populations used to assess clinal variation. (d) P-value distributions from logistic regressions of allele frequency with latitude (bins of 0.01). Error bars are two standard error (not visible).
