In order to answer this question, a team of researchers in Germany turned to the Nasonia vitripennis wasp, a species famous for its propensity to lay its parasitic eggs on doomed fly pupae. (sciencemag.org)
Male wing size increases by 45 % through cell size and cell number changes when the ws1 allele from N. giraulti is backcrossed into a N. vitripennis genetic background. (journals.plos.org)
This suggests that the ability to produce the RS - RR mixture may have started off as a neutral genetic mutation among an earlier lineage of N. vitripennis males. (sciencemag.org)