Not surprising, but at least proof of concept, or actually instantiation of concept.
Mertins, Vanessa; Schote, Andrea B.; Meyer, Jobst. Variants of the Monoamine Oxidase A gene (MAOA) predict free-riding behavior in women in a strategic public goods experiment. Journal of Neuroscience, Psychology, and Economics, Vol 6(2), Jun 2013, 97-114.
Cross posted to Cognition and Evolution. For more information about wealth distribution among players with different hardware, go here.