Heliconius spp. on Passiflora viticola (image) Smithsonian Tropical Research Institute Share Print E-Mail Caption A single gene controls the repeated evolution of red color patten mimicry in passion-vine butterflies. Credit STRI Usage Restrictions Credit: STRI Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.