Maurine Neiman, University of Iowa (IMAGE) University of Iowa Caption University of Iowa evolutionary biologist Maurine Neiman and colleagues found sexual reproduction yields new gene combinations that help the snails fend off threats. Credit Maurine Neiman, Univ. of Iowa Usage Restrictions None License Licensed content 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.