Fig. 3.

Spatial genomic variation in megabase-scale inversions in Atlantic cod. (A) Allele frequency distribution of four inversions (on LG01, 02, 07, and 12) in four modern populations. The collinear allele (gray) and inverted allele (yellow) segregate as biallelic loci. (B) Individual inversion genotypes of ancient Atlantic cod. The collinear (gray, AA), inverted (yellow, BB), and heterozygote (yellow/gray, AB) genotypes segregate independently on four chromosomes. (C) Genotypic affinity of ancient specimens. The overall probability of obtaining the ancient individual’s composite genotype was calculated by binomial sampling of inversion genotypes from the respective allele frequency distributions of the four modern populations.