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By the 1920s, the number of states banning cousin marriage had doubled. [183] 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.
The extent to which the risk increases depends on the degree of genetic relationship between the parents; so the risk is greater in mating relationships where the parents are close relatives, but for relationships between more distant relatives, such as second cousins, the risk is lower (although still greater than the general population).
Family tree showing the relationship of each person to the orange person, including cousins and gene share. A family tree, also called a genealogy or a pedigree chart, is a chart representing family relationships in a conventional tree structure. More detailed family trees, used in medicine and social work, are known as genograms.
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Marriages between first cousins are legal in 19 states. For premium support please call: 800-290-4726 more ways to reach us
Same-sex marriage is legally permitted across the country since June 26, 2015, when the Supreme Court issued its decision in Obergefell v. Hodges. Polygamy is illegal throughout the U.S. [15] Although marriages of first cousins are illegal in many states, they are legal in many other states, the District of Columbia and some territories. Some ...
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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.