| asymmetrical sexual isolation but no postmating isolation between the closely related species drosophila suboccidentalis and drosophila occidentalis. | during the speciation process several types of isolating barriers can arise that limit gene flow between diverging populations. studying recently isolated species can inform our understanding of how and when these barriers arise, and which barriers may be most important to limiting gene flow. here we focus on drosophila suboccidentalis and d. occidentalis, which are closely related mushroom-feeding species that inhabit western north america and are not known to overlap in geographic range. we in ... | 2015 | 25881167 |