The harm of consanguineous marriage is relatively high, and the probability of offspring falling ill is relatively high, which contradicts China's policy of eugenics and child rearing. Moreover, consanguineous marriage violates morality and is prohibited by Chinese law.
1、 Reasons why close relatives cannot get married
1. Both parties in consanguineous marriage are likely to inherit the same gene from a common ancestor. If this gene is inherited in an autosomal recessive manner, their children are likely to develop the disease due to being homozygous for mutations. Therefore, children born from consanguineous marriage have a higher probability of developing the disease, which does not comply with China's policy of eugenics and child rearing.
2. Marriage between close relatives violates ethics and morality, and is not in line with the tradition of our country.
3. The Marriage Law of our country clearly stipulates that marriage is prohibited for close relatives.
2、 The harm of consanguineous marriage
1. Marriage between close relatives is illegal, and the marriage registration office will not handle marriage registration. Moreover, if a marriage certificate is obtained by chance and later discovered, it is also considered an invalid marriage.
2. The mortality rate of offspring from consanguineous marriage is relatively high. Due to the high possibility of both parties obtaining the same pathogenic gene from a common ancestor, the probability of offspring developing the disease will be higher than that of ordinary children, and the mortality rate will be relatively higher.
3. Marriage between close relatives can greatly increase the probability of recessive genetic diseases. According to relevant data, the incidence of recessive genetic diseases in offspring of consanguineous marriages is 150 times higher than that in offspring of non consanguineous marriages.
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.