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Is there a common gene that unites monogamous species?

Scientists have studied the arginine vasopressin 1a receptor (avpr1a) gene as a possible source for genetic control of monogamous social behavior. This gene was initially thought to cause social monogamy with a repetitive element in its receptor, but recent studies have observed that this same element is widespread in nonmonogamous species as well. As a result, the current consensus is that no single gene directs a species toward monogamy. Instead, monogamy is most likely the result of complex and flexible mating systems.

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