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first cousin once removed: 6.25% (2 −4) 5: 6: 3: second cousin: 3.125% (2 −5) 4: 4: 4: great-great-grandmother / great-great-grandfather / great-great-granddaughter / great-great-grandson: 6.25% (2 −4) 4: 5: 4: great-grandaunt / great-granduncle / great-grandniece / great-grandnephew: 6.25% (2 −4) 5: 6: 4: first cousin twice removed: 3. ...
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.
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 ...
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.
When the subject and the relative have an additional removal they are cousins. A cousin with minimal removal is a first cousin, i.e. the child of the subjects uncle or aunt. Degrees of collaterality and removals are used to more precisely describe the relationship between cousins.
As aunt/uncle and niece/nephew are separated by one generation, they are an example of a second-degree relationship. Unless related by marriage, they are 25% or more related by blood if the aunt/uncle is a full sibling of one of the parents, or 12.5% if they are a half-sibling .