If both parties are in a direct blood relationship or collateral blood relationship within three generations, registering for marriage is considered a consanguineous marriage and is illegal.
1、 Can people with blood ties get married
1. Blood relationship is divided by distance. If both parties belong to direct blood relatives or collateral blood relatives within three generations, according to the Marriage Law of China, they cannot get married. Marriage between two individuals with direct blood relatives or collateral blood relatives within three generations is considered consanguineous marriage. consanguineous marriage does not meet the conditions for marriage and has a significant impact on the health of future generations.
2. If both parties are distant relatives and do not fall within the scope of consanguineous marriage, they can get married.
2、 The harm of consanguineous marriage
1. Increase the incidence rate of recessive genetic diseases
Since consanguineous marriage is a marriage within three generations of kinship, the probability of having similar genes in the couple's bodies is much higher than the probability of having similar genes in two unrelated individuals. In this case, the likelihood of offspring developing recessive genetic diseases is tens or even hundreds of times higher than that of normal children. Therefore, in the case of consanguineous marriage, the incidence of recessive genetic diseases in offspring will be an important factor affecting the health of children.
2. Increase the incidence rate of polygenic genetic diseases
Not only will the incidence rate of recessive genetic diseases be significantly higher than normal under the condition of close marriage, but also the incidence rate of polygenic genetic diseases is the same. Polygenic genetic diseases include congenital heart disease, anencephaly, spinal cord fission, etc. The incidence rate of these diseases in normal children is 0.57%, and the incidence rate of these diseases in children born from close marriage is 1.64%. From this, we can see that consanguineous marriage is extremely significant in inducing polygenic genetic diseases.
3. High mortality and deformity rates
In addition to some genetic diseases, offspring of consanguineous marriages may also experience deformities. These situations collectively lead to a higher mortality rate for these children.
4. Underdeveloped offspring
If the offspring of consanguineous marriage can survive and escape the erosion of various diseases, then their physical fitness in the future growth and development process is not as strong as that of normal children. Generally speaking, children born from consanguineous marriage may experience symptoms such as physical decline, weight loss, and reduced height during their future development, which are extremely detrimental to their growth.