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Do single genes cause variation in traits or are gene effects more complex than that? How do genes interact with one another, and how do those interactions alter the pace and direction of evolution? Do those interactions constrain or facilitate evolution? Tune in to hear Art and Marty talk with Mihaela Pavlicev about these questions and more! Mihaela is a geneticist at the Cincinnati Children’s Hospital Medical Center, where she studies big new ideas about links between genes and traits.