The effects of "Wolbachia" in "Trichogramma" have several evolutionary implications. Commonly, uninfected wasps are unable to breed with infected wasps. Many generations of reproductive isolation of these different groups may result in speciation. In addition, some hosts can evolve with a dependency on "Wolbachia" for core reproductive functions, such as oogenesis, so that eventually an infection is a requirement for successful reproduction. Finally, "Wolbachia" can influence gender determination in its hosts so that more females are successfully born. This results in a reversal in sexual selection, where females must compete for male mates, which has evolutionary implications as it exposes different phenotypes to natural selection.