Close relatives are not allowed to marry. According to the provisions of Article 6, paragraph 4, of China's Marriage Registration Regulations, the marriage registration authority shall not allow marriage registration if it is a direct blood relative or a collateral blood relative within three generations. Therefore, marriage between close relatives cannot be registered, and marriage between close relatives will also increase the risk of genetic diseases.
Close relatives are not allowed to marry. According to Article 7 of China's Marriage Law, marriage is prohibited under any of the following circumstances: (1) immediate blood relatives and collateral blood relatives within three generations. According to the provisions of Article 6, paragraph 4, of China's Marriage Registration Regulations, the marriage registration authority shall not allow marriage registration if it is a direct blood relative or a collateral blood relative within three generations.
Consanguineous marriages increase the risk of certain autosomal recessive genetic diseases. According to the survey, the recessive genetic disease of the offspring of inbred marriage will be 150 times more recessive genetic disease of non-inbred marriage offspring. The incidence of polygenic diseases such as congenital heart disease, anencephaly and spinal cord fission in the offspring of consanguineous marriage was about 1.64%, which was higher than 0.57% in the children of non-consanguineous marriage. Hypertension, schizophrenia, epilepsy and other genetic diseases, the incidence of children born to close relatives is also significantly higher than that of non-close relatives.
The early death rate and deformity rate of children who are closely married are also relatively high, and the offspring are often poor in physique, lighter in weight, and shorter in height.