
Genetic differentiation in the region encompassing the putative inversion on Chromosome 12. (A) Allele frequencies for all SNPs (n = 11,965) inside the inversion among individuals homozygous for the Southern (S) (y-axis) or Northern (N) haplotypes (x-axis). All frequencies are expressed in terms of the allele that is more common in the “N-”context than in the “S-”context. (B,C) Estimated frequencies for the Northern and Southern haplotypes in pooled population samples in the Baltic Sea and East Atlantic (B) and in the West Atlantic (C). The location and date of capture of the pooled samples are listed in Lamichhaney et al. (2017).











