Heliconius spp. on Passiflora viticola (image) Smithsonian Tropical Research Institute Caption A single gene controls the repeated evolution of red color patten mimicry in passion-vine butterflies. Credit STRI Usage Restrictions Credit: STRI 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.