Will marriage between cousins ??affect the next generation?

About three generations. From the perspective of modern eugenic genetics, cousin marriages can easily cause recessive genetic diseases. After marriage, dominant genetic diseases will appear in the next generation, leading to a significant increase in the incidence.

Because cousins ??are prone to carry the same type of recessive genetic disease, they will not develop the disease due to their own physical conditions, but in the next generation, couples may carry the same type of recessive genetic disease. Recessive genetic genes, the chance of the next generation developing a dominant genetic disease is also significantly increased, so marriage is generally prohibited within three generations. But in the end, whether to get married depends on the relationship between the two people, and whether to raise children is also an issue that needs to be considered. After all, there are certain risks.

Notes

1. Marriage is not allowed between parents and children, between grandparents and grandchildren, and between grandmothers and grandfathers and their grandchildren and granddaughters.

2. You cannot marry your uncle, uncle, uncle, aunt, or aunt.

3. You cannot marry your own brothers, sisters, cousins, and cousins.

4. Brothers and sisters who have the same origin as their parents (including half-brothers and half-brothers and half-fathers). That is, children of the same parents cannot marry.

5. Uncles, uncles, aunts, uncles, aunts and nieces (daughters) of different generations. That is, an uncle (uncle) cannot marry his brother (brother)'s daughter.

Reference for the above content? Baidu Encyclopedia - Consanguineous Marriage

Reference for the above content? People's Daily Online - Consanguineous marriage has caused serious social problems in Yemen