Genome-wide tests for introgression between cactophilic Drosophila implicate a role of inversions during speciation.

ABSTRACT: Models of speciation-with-gene-flow have shown that the reduction in recombination between alternative chromosome arrangements can facilitate the fixation of locally adaptive genes in the face of gene flow and contribute to speciation. However, it has proven frustratingly difficult to show empirically that inversions have reduced gene flow and arose during or shortly after the onset of species divergence rather than represent ancestral polymorphisms. Here, we present an analysis of whole genome data from a pair of cactophilic fruit flies, Drosophila mojavensis and D. arizonae, which are reproductively isolated in the wild and differ by several large inversions on three chromosomes. We found an increase in divergence at rearranged compared to colinear chromosomes. Using the density of diver

SUBMITTER: Lohse K 

PROVIDER: S-EPMC5029762 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature