Avunculate marriage is permitted in Norway, Denmark, Germany, Belgium, Switzerland,[1] Austria, Czech Republic, Chile, Argentina, Brazil, Australia,[2] Canada,[3] Finland,[4] Macau,[5] Malaysia,[6] The Netherlands,[7] Cuba and Russia.
[20] The Talmud and Maimonides encourage marriages between uncles and nieces, though some Jewish religious communities, such as the Sadducees, believed that such unions were prohibited by the Torah.
As a result, instead of Charles' parents, grandparents, great-grandparents, great-great-grandparents, great-great-great-grandparents, and great-great-great-great-grandparents adding up to 126 different individuals, they numbered only 50.
This is extensively featured as a plot device in many south Indian movies, such as Thaamirabharani (2007)[24] and Thai Maaman (1994).
This means that on average the progeny of an uncle–niece or a double first cousin marriage will be expected to have inherited identical gene copies at 1/8 of all their loci, defined as a coefficient of inbreeding F = 0.125.
A significant decrease in the mean birth weight and head circumference of babies born to consanguineous parents was noted in both the poor and middle/upper socioeconomic class.
The mean length was less in babies born to consanguineous parents belonging to the poor social class only.