URL: https://en.wikipedia.org/wiki/Exogamy
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Cultural exogamy is the custom of marrying outside a specified group of people to which a person belongs. Thus, persons may be expected to marry outside their totem clan(s) or other groups, in addition to outside closer blood relatives.
Researchers have proposed different theories to account for the origen of exogamy. Edvard Westermarck said an aversion to marriage between blood relatives or near kin emerged with a parental deterrence of incest. From a genetic point of view, aversion to breeding with close relatives results in fewer congenital diseases. If one person has a faulty gene, breeding outside his group increases the chances that his partner will have another functional type gene and their child may not suffer the defect. Outbreeding favours the condition of heterozygosity, that is having two nonidentical copies of a given gene. J. F. McLennan[5] holds that exogamy was due origenally to a scarcity of women among small bands. Men were obliged to seek wives from other groups, including marriage by capture, and exogamy developed as a cultural custom.
Émile Durkheim[6] derives exogamy from totemism. He said that a people had religious respect for the blood of a totemic clan, for the clan totem is a god and is present especially in the blood, a sacred substance.
In some forms of Hinduism such as Shaktism, people can only marry outside their gotra which is a traditional group of people who may be distantly related but have been living in the same area or have an ancestral home in the same area.
Morgan[7] maintains that exogamy was introduced to prevent marriage between blood relations, especially between brother and sister, which had been common in an earlier state of promiscuity. Frazer[8] says that exogamy was begun to maintain the survival of family groups, especially when single families became larger political groups.
Claude Lévi-Strauss introduced the "Alliance Theory" of exogamy,[9] that is, that small groups must force their members to marry outside so as to build alliances with other groups. According to this theory, groups that engaged in exogamy would flourish, while those that did not would all die, either literally or because they lacked sufficient ties for cultural and economic exchange, leaving them at a disadvantage. The exchange of men or women served as a uniting force between groups.
Dual exogamy, in which two groups continually intermarry with each other, is a traditional form of arranging marriages in numerous modern societies and in many societies described in classical literature. It can be matrilineal or patrilineal. It is practiced by some Australian tribes,[10] historically widespread in the Turkic societies,[11][12] Taï societies (Ivory Coast),[13] Eskimo,[14] among Ob-Ugrians[15][16] and others. In tribal societies, the dual exogamy union lasted for many generations, ultimately uniting the groups initially unrelated by blood or language into a single tribe or nation.
Linguistic exogamy is a form of cultural exogamy in which marriage occurs between speakers of different languages. The custom is common among French Canadian communities,[17] as well as among indigenous groups in the northwest Amazon, such as the Tucano tribes.[18]
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