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social group based on actual or alleged unilineal descent from a common ancestor. Such groups have been known in all parts of the world and include some that claim the parentage or special protection of an animal, plant, or other object (see totem).
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siba term used in US ANTHROPOLOGY to refer to a body of people claiming common UNILINEAL DESCENT. The more common term is CLAN.
one of the offspring of the same parents, a brother or sister. The frequency of the appearance of a certain hereditary character (including hereditary disease) among sibs makes it possible to evaluate the type of inheritance involved and to predict the probability of the manifestation of the character in other offspring of the same mating or in animals during crossbreeding. The term “sib” is used in animal and human genetics.