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In the Western world, some Anabaptist groups are highly inbred because they originate from small founder populations that have bred as a closed population. [83] Of the practicing regions, Middle Eastern and northern African nations show the greatest frequencies of consanguinity. [71]
"June", born in 1948, and "Tim Colt", born in 1943, were originally from New Zealand. June, who was the product of brother-sister incest, married Tim in 1966.The couple had seven children together: Martha, Frank, Paula, Cherry, Rhonda, Betty, and Charlie, before moving to Victoria in the 1970s. [1]
If the parents of an individual are not inbred themselves, the coefficient of inbreeding of the individual is one-half the coefficient of relationship between the parents. This can be verified in the previous example, as 12.5% is one-half of 25%, the coefficient of relationship between an uncle and a niece.
Cousin marriage rates from most African nations outside the Middle East are unknown. An estimated 35–50% of all sub-Saharan African populations either prefer or accept cousin marriages. [61] In Nigeria, the most populous country of Africa, the three largest ethnic groups in order of size are the Hausa, Yoruba, and Igbo. [62]
The Denkard, which includes passages encouraging the action, and the Dadestan-i Denig both claim that not only was the world created through xwedodah, but humanity from the Consanguine marriage of Mashya and Mashyana, who were born from the spiritually-incestuous relationship of Keyumars (produced from xwedodah with Armaiti) and Spenta Armaiti ...
Without pedigree collapse, a person's ancestor tree is a binary tree, formed by the person, the parents (2), the grandparents (4), great-grandparents (8), and so on. However, the number of individuals in such a tree grows exponentially and will eventually become impossibly high.
Consanguine marriage is marriage between individuals who are closely related. Though it may involve incest, it implies more than the sexual nature of incest.In a clinical sense, marriage between two family members who are second cousins or closer qualifies as consanguineous marriage.
[25]: 187 Consanguinity is a deeply rooted phenomenon in 20% of the world population, mostly in the Middle East, West Asia and North Africa. [25] Globally, the most common form of consanguineous union is between first cousins, in which the spouses share 1 ⁄ 8 of their genes inherited from a common ancestor, and so their progeny are homozygous ...