Close relatives refer to those who have a common blood relationship within three or more generations. If two people in this relationship get married, it belongs to consanguineous marriage. The harm of consanguineous marriage is significant and is expressly prohibited by law.
The harm of consanguineous marriage
1. Marriage between close relatives is illegal, and the marriage registration office will not provide it
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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.