image: This image shows the variation in abdominal pigmentation of African Drosophila melanogaster flies. This image relates to an article that appeared in the Dec. 18 issue of Science, published by AAAS. The study, by Dr. Mark Rebeiz of the University of Wisconsin in Madison, Wis., and colleagues, was titled, "Stepwise Modification of a Modular Enhancer Underlies Adaptation in a Drosophila Population." view more
Credit: Image courtesy of Mark Rebeiz