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A biologist says that some people are genetically programmed to be unfaithful to their partners. He's found that if one female twin has a history of infidelity, the chances that her sister will too is about 55%, and this is strongest in identical twins, who have the same genes. He studied women instead of men because only about 23% of females are unfaithful. However, another researcher has fond a gene that, when inserted into the brain of a male rodent, can change promiscuous critters into faithful partners.
Researcher Larry Young says, "Our study...provides evidence in a comparatively simple animal model, that changes in the activity of a single gene profoundly can change a fundamental social behavior of animals within a species." He used a harmless virus to transfer a sex hormone gene from monogamous prairie voles into the brains of their non- monogamous relatives, the meadow voles. After the gene transfer, the previously promiscuous meadow voles showed a preference for their current partners.