Male eye span in stalk-eyed flies indicates genetic quality by meiotic drive suppression

Sexual selection in through female preference for male genetic quality is a controversial subject, as genetic mechanisms have insufficient variation in male quality to account for preference and ornament evolution. Research now shows that females have a preference for ornaments indicating genetic quality generated by conflict by sex chromosomes. Sex-ratio distributions were compared in stalk-eyed fly progeny, and female-biased sex ratios occurred in species show eye-stalk sexual dimorphism, and a female preference for long eye span.