Fig. 2From: Oviposition traits generate extrinsic postzygotic isolation between two pine sawfly speciesCross design for assessing postzygotic isolation. Because Neodiprion have haplodiploid sex determination, unfertlilized eggs from an interspecific mating will produce male offspring of the mother’s genotype. Backcross females were unmated, while parental species and F1 hybrid females were matedBack to article page