According to the World Population Review, first cousin marriages are common in Muslim-majority nations. There are studies showing that first cousin marriages have a significant negative impact on intelligence, and health over generations. Some Mennonites also marry first cousins. Studies comparing health and intelligence to first cousin marriages are dated or not considered definitive. However, […] The post The Effect of Consanguineous Marriages in Some Societies appeared first on www.independentsentinel.com.