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By the 1920s, the number of states banning cousin marriage had doubled. [185] Since that time, Kentucky (1943) and Texas have banned first-cousin marriage and since 1985, Maine has mandated genetic counseling for marrying cousins to minimise risk to any serious health defect to their children.
In some communities and time periods, cousin marriage is allowed or even encouraged; in others, it is taboo, and considered to be incest. The degree of relative consanguinity can be illustrated with a consanguinity table in which each level of lineal consanguinity ( generation or meiosis ) appears as a row, and individuals with a collaterally ...
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.
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first cousins (which is counted as fourth degree of kinship in Roman civil law tradition) In Imperial China (221 BCE to 1912), marriage between first cousins was partially allowed. Marrying the child of one’s paternal aunt, maternal uncle, or maternal aunt was generally accepted in Chinese history during most of China’s dynastic era.
Global prevalence of consanguine marriage (marriage between two family members who have coefficient of relationship r = 3.125% or higher), illustrating a higher prevalence of cousin marriage in the Middle East in 2013. Globally, 8.5% of children have consanguineous parents, and 20% of the human population live in communities practicing endogamy.
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A cousin marriage is a marriage where the spouses are cousins (i.e. people with common grandparents or people who share other fairly recent ancestors). The practice was common in earlier times and continues to be common in some societies today, though in some jurisdictions such marriages are prohibited. [1]