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The writings of Scottish deputy commissioner for lunacy Arthur Mitchell claiming that cousin marriage had injurious effects on offspring were largely contradicted by researchers such as Alan Huth and George Darwin.

In South Asia, rising demands for dowry payments have caused dire economic hardship and have been linked to dowry deaths in a number of North Indian states.

The percentage of consanguinity between any two individuals decreases fourfold as the most recent common ancestor recedes one generation.

Groups like the Kachin exhibiting matrilateral cross-cousin marriage do not exchange women in circular structures; where such structures do exist they are unstable. [1] In some countries outside that region, it is uncommon but still legal.

[171] Whatever the reasons, written justifications for such bans had been advanced by St my brother is dating your cousin.Where permissible, marriage to a close relative is hence regarded as a more economically feasible choice.By the 11th century, with the adoption of the so-called canon-law method of computing consanguinity, these proscriptions had been extended even to sixth cousins, including by marriage.[162] In such a society even the presence of a limited amount of cross-cousin marriage will not break the isolation of the kin group, for first cross cousins often end up being second parallel cousins.Population subdivision results from decreased gene flow among different groups in a population.

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