Figure 5 .

Individual SNP frequencies along the latitudinal gradient in Cameroon, based on loci that most strongly differentiated populations at opposite ends of the gradient. Frequencies are plotted with respect to the allele predominating in the southern population in (A) the collinear genome, (B) the 2Rb rearrangement, and (C) the 2La –75th percentile); the horizontal line marks the median. Upper (lower) whiskers include the maximum (minimum) values unless the distance from the first (third) quartile exceeds 1.5× that of the IQR. Outlier values smaller or larger than the whiskers are indicated by dots. N, northern population; S, southern population; C, central population, partitioned by karyotype into 2La/a and 2L+^a/+^a homozygotes.