James N. Thompson, Jr., is a David Boyd Professor in the Department of Zoology at the University of Oklahoma. He has taught genetics for almost thirty years. His research interests are in genetic responses and adaptation to stress, genotype and environment interactions in quantitative traits, and variation in mutation rate. Jenna J. Hellack is Professor and Chairperson of the Department of Biology at the University of Central Oklahoma. She currently teaches introductory genetics, evolution, and molecular and population genetics courses. Her research interests are in the area of population genetics. David S. Durica has been a member of the Department of Zoology at the University of Oklahoma since 1988, where he teaches both undergraduate and graduate courses in genetics. His research focuses on developmental genetics and the organization and expression of multigene families.