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The legal status of cousin marriage varies considerably from one U.S. state to another, ranging from being legal in some states to being a criminal offense in others. It is illegal or largely illegal in 31 states and legal or largely legal in 19. However, even in the states where it is legal, the practice is not widespread.
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.
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 offspring may receive ...
Even with the chart and the explanations above, it can be hard to map a concept like “second cousin thrice removed” onto real-life Maureen, who you know only as making the best potato salad at ...
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.
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.
Pedigree chart. A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes [jargon] of a particular gene or organism and its ancestors from one generation to the next, [1] [2] [3] [unreliable source?] most commonly humans, show dogs, and race horses .
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.