During this week's journal club, we discussed Elaina Tuttle et al.'s interesting genomic analysis of the inversion polymorphism in the white throated sparrow. The story is published in Current Biology and contains an old inversion with two old haplotypes, strong phenotypic variation, disassortative mating on phenotypes, possibly strong selection again one of the homozygous and degradation of one of the haplotypes in a process similar to that of sex chromosomes. Recommended reading!
Tuttle et al's figure 1 showing the morphs and the phylogeny of the white throated sparrow and its relatives based on most of the genome and the inverted region, respectively.