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The coefficient of relationship is a measure of the degree of consanguinity (or biological relationship) between two individuals. The term coefficient of relationship was defined by Sewall Wright in 1922, and was derived from his definition of the coefficient of inbreeding of 1921. The measure is most commonly used in genetics and genealogy.
In clinical genetics, consanguinity is defined as a union between two individuals who are related as second cousins or closer, with the inbreeding coefficient (F) equal or higher than 0.0156, where (F) represents the proportion of genetic loci at which the child of a consanguineous couple might inherit identical gene copies from both parents.
Data on cousin marriage in the United States are sparse. It was estimated in 1960 that 0.2% of all marriages between Roman Catholics were between first or second cousins, but no more recent nationwide studies have been performed. [175] It is unknown what proportion of that number were first cousins, which is the group facing marriage bans.
Ever wondered what your mother’s cousin’s son is to you? Or just what exactly “twice removed” means? Here’s a guide to help you find the right term for those complicated family ties.
First cousins are both the second generation removed from their shared grandparents. Second cousins are the third generation removed from shared great-grandparents. So: cousin plus one is the ...
Consanguine marriage. Consanguine marriage is marriage between individuals who are closely related. Though it may involve incest, it implies more than the sexual nature of incest. In a clinical sense, marriage between two family members who are second cousins or closer qualifies as consanguineous marriage. This is based on the gene copies their ...
Cousin. A cousin is a relative that is the child of a parent's sibling; this is more specifically referred to as a first cousin. More generally, in the kinship system used in the English-speaking world, a cousin is a type of relationship in which relatives are two or more generations away from their most recent common ancestor.
Worldwide, more than 10% of marriages are between first or second cousins. [2] Cousin marriage is an important topic in anthropology and alliance theory. [3] In some cultures and communities, cousin marriages are considered ideal and are actively encouraged and expected; in others, they are seen as incestuous and are subject to social stigma ...