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The lower the rates of genetic monogamy among socially monogamous pairs, the less of a role social monogamy plays in determining how genes are distributed among offspring.

Polygyny occurs when one male gets exclusive mating rights with multiple females.

Social monogamy refers to a male and female's social living arrangement (e.g., shared use of a territory, behaviour indicative of a social pair, and/or proximity between a male and female) without inferring any sexual interactions or reproductive patterns.

In humans, social monogamy takes the form of monogamous marriage.

Genetic tests frequently show that some of the offspring raised by a monogamous pair come from the female mating with an extra-pair male partner.There are four basic systems: Monogamy occurs when one male mates with one female exclusively.A monogamous mating system is one in which individuals form long-lasting pairs and cooperate in raising offspring.These pairs may last for a lifetime, such as in pigeons, In contrast with tournament species, these pair-bonding species have lower levels of male aggression, competition and little sexual dimorphism.Zoologists and biologists now have evidence that monogamous pairs of animals are not always sexually exclusive.

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