1. Consanguineous marriage refers to the marriage of direct blood relatives and collateral blood relatives within three generations, which violates traditional ethical and moral principles in China.
2. Article 7 of China's Marriage Law clearly stipulates that consanguineous marriage is an illegal act.
3. Children who marry close relatives have a higher early mortality and deformity rate.
4. The incidence rate of some polygenic genetic diseases in close marriage is higher than that in non close marriage. According to the survey, the incidence rate of polygenic diseases such as congenital heart disease and anencephalic spinal cord fission in the offspring of close relatives is about 1.64%, higher than 0.57% in the children of non close relatives.
5. Marriage between close relatives can greatly increase the probability of developing recessive genetic diseases. According to relevant data, the number of recessive genetic diseases in offspring of consanguineous marriages will be 150 times higher than that in offspring of non consanguineous marriages, which is not in line with China's policy of eugenics and child rearing.
