The children born of close marriage will have poor physique, lower weight and shorter height; Early mortality and malformation rates are higher, and the incidence of dementia and genetic diseases is higher than that of children who are not closely married.
1. What happens to children born of first Cousins
Inbreeding couples may acquire the same gene from their common ancestor and pass it on to their children, and if this gene is inherited in an autosomal recessive way, their children may develop the disease because of the mutation homozygous, so inbreeding increases the risk of certain autosomal recessive genetic diseases. The recessive genetic disease in the offspring of inbred marriage will be 150 times more than that in the offspring of non-inbred marriage. According to the survey, the incidence of polygenic diseases such as congenital heart disease, anencephaly, and spinal cord fission in the offspring of consanguineous marriages is about 1.64%, which is higher than that of non-consanguineous children.
Second, what is the meaning of marriage between close relatives
Consanguineous marriage refers to the marriage of immediate blood relatives and collateral blood relatives within three generations, which is called consanguineous marriage.
Direct blood relatives, including parents and children, grandparents, maternal grandparents and grandchildren, grandchildren and grandchildren can not marry.
Collateral blood relatives within three generations include: brothers and sisters (including half-brothers and half-brothers and sisters) from the same parents can not marry; Uncles, uncles, aunts, aunts, nephews (girls) and nephews (girls) of different generations, that is, uncles (uncles) cannot marry the daughters of older brothers (boys); An aunt cannot marry her brother's son; An uncle cannot marry a sister's daughter; An aunt cannot marry a sister's son.