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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.
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.
It is common to identify one's first- and second-degree cousins, and sometimes third-degree cousins. It is seldom possible to identify fourth-degree cousins, since few people can trace their full family tree back more than four generations.
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 ...
A half-niece or half-nephew is the child of one's half-sibling, related by 12.5%. [22] [23] In some cultures and family traditions, it is common to refer to cousins with one or more removals to a newer generation using some form of the word niece or nephew. For more information see cousin.
The terms "half-brother" and "half-sister" indicate siblings who share only one biological parent. The term "aunt-in-law" refers to the aunt of one's spouse. "Uncle-in-law" is the uncle of one's spouse. "Cousin-in-law" is the spouse of one's cousin, or the cousin of one's spouse.
It follows that for first cousin progeny, F = 0.0625, that is, 1/16 loci predictably are homozygous, whereas for second cousins, F = 0.0156, that is, 1/64 of loci are homozygous. [ 25 ] A 1990 study conducted in South India found that the incidence of malformations was slightly higher in uncle-niece progeny (9.34%) compared to the first cousin ...
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