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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.
First, second, and third cousins (and so on unto infinity cousins) are an equal number of generations removed from the common ancestor. First cousins are both the second generation removed from ...
The terms cousin-uncle/aunt and cousin-niece/nephew are sometimes used to describe the direction of the removal of the relationship, [7] especially in Mennonite, [8] Indian, and Pakistani [citation needed] families. These terms relate to a first cousin once removed, uncle/aunt referring to an older generation and niece/nephew for younger ones.
Five states prohibit first-cousin-once-removed marriages. [4] Some states prohibiting cousin marriage recognize cousin marriages performed in other states, but despite occasional claims that this holds true in general, [5] laws also exist that explicitly void all foreign cousin marriages or marriages conducted by state residents out of state.
This makes President Carter a half second-cousin of producer Berry Gordy. He is also a half second-cousin, once removed, of LMFAO rapper Redfoo (Stefan Kendal Gordy). s_bukley/depositphotos.
In Pakistan, where there has been cousin marriage for generations and the current rate may exceed 50%, one study estimated infant mortality at 12.7 percent for married double first cousins, 7.9 percent for first cousins, 9.2 percent for first cousins once removed/double second cousins, 6.9 percent for second cousins, and 5.1 percent among ...
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.
1540–1541, Second cousin once-removed Arthur Stewart, Duke of Albany 1541, Brother James Hamilton, 2nd Earl of Arran 1541, Second cousin once-removed James Hamilton, 2nd Earl of Arran: Heir presumptive Second cousin 21 April 1541 Second cousin once-removed died 8 December 1542 Daughter born to king James Hamilton Son Mary Stewart: Heiress ...