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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. [25]
Data on cousin marriage in the United States are sparse. It was estimated in 1960 that 0.2% of all marriages between Roman Catholics were between first or second cousins, but no more recent nationwide studies have been performed. [175] It is unknown what proportion of that number were first cousins, which is the group facing marriage bans.
Roman civil law prohibited marriages within four degrees of consanguinity. [3] This was calculated by counting up from one prospective partner to the common ancestor, then down to the other prospective partner. [4] The first prohibited degree of consanguinity was a parent-child relationship while a second degree would be a sibling relationship.
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.
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 ...
Texas also has a lower median household income compared to the national median. In Texas, the median household income between 2017 and 2021 was $67,321, and $74,580 nationwide in 2022.
Consanguinity is practiced regardless of religious influences and is a result of cultural, historical, regional, and socio-economic factors. [2] [6] A greater number of consanguineous marriages are observed in rural areas compared to urban areas within the same region. This is attributed to the tendency of individuals in rural areas to marry at ...
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