Figure 2: Inversion region and PCR genotyping.
From: Young inversion with multiple linked QTLs under selection in a hybrid zone

a, Chromosome blocks (yellow and red) are shown for the derived (Bsi-inv, upper) and ancestral (Bsi-std, lower) haplotypes. Centromeres are indicated by white circles. Scaffolds (blue, above and below) are labelled with their name and size. Breakpoints are shown as vertical red lines in the scaffolds. Arrows indicate PCR primers. There are 1,591 annotated genes in the inversion region. b, Gel image showing PCR products, allowing codominant identification of inversion (INV) genotypes. STD, standard.