| do wolbachia infections play a role in unidirectional incompatibilities in a field cricket hybrid zone? | two closely related field crickets, gryllus firmus and g. pennsylvanicus, hybridize along an extensive north-south zone in the eastern united states. crosses between g. firmus males and g. pennsylvanicus females produce viable and fertile f1, but the reciprocal cross consistently fails to produce offspring. wolbachia, a bacterial parasite of arthropods that causes unidirectional incompatibilities in a variety of insect species, has been suggested as the cause of the observed incompatibility betw ... | 2001 | 11298981 |