Generally speaking, the marriage of Cousins will affect the next generation, which will greatly increase the incidence of recessive genetic diseases, early mortality and deformity rates of the next generation. As long as their children are no longer inbred, and subsequent generations are no longer inbred, it will not be affected.
Close relatives are close relatives who have a common ancestor within three generations. China's marriage law stipulates that blood relatives within three generations are forbidden to marry, including the third generation, that is, Cousins are forbidden to marry. Now the international advocate of eugenic and eugenic, and social mobility is large, we should avoid marriage between close relatives, otherwise it will bring these four hazards to the next generation:
3. The early death rate and deformity rate of the offspring of consanguineous marriage are also high.
4, the marriage of close relatives is likely to lead to the next generation of physical decline, weight loss, shorter height.