Fruit Fly (IMAGE) University of Toronto Caption A genetic study by evolutionary biologists using fruit flies (Drosophila melanogaster) has shown that organisms with low-quality genes may produce offspring with even more inferior chromosomes, possibly leading to the extinction of certain species over generations. Credit Nathaniel Sharp 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.