Brother and sister marriage to give birth to children will lead to a great increase in the incidence of genetic diseases, infant mortality, may be born deformed children, may also get leukemia or low IQ, so for the health of the next generation, the state strictly prohibits marriage between close relatives.
Close relatives refer to those who have a common ancestor within three generations and are closely related by blood, including brother and sister. A child born of a sibling marriage may have the following effects:
1. Increased incidence of genetic diseases
Children born of brother and sister marriage have a very clear risk of disease, because they come from the same ancestor, most of the genes are the same. In other words, consanguineous marriages will provide a convenient path for genetic diseases. The probability that the offspring of normal married couples will have an invisible genetic disease is 1 in 4 million, while the probability of offspring of close married couples will have an invisible genetic disease is as high as 1 in 64.
2. High mortality rate
The death rate of children born to brother-sister marriages is as high as 80%, which is more than three times the death rate of children born to non-close relatives.
3. Congenital deformed children
Children born from brother and sister marriage will be affected by disease genes in the mother's abdomen, and may be born with a high probability of congenital deformity.
4. Leukemia
Children born to brother-sister couples are 13.5 times more likely to have leukemia.
5. Low IQ
Brother and sister married children intelligence polarization is serious, one is the IQ is particularly high, but the probability of the offspring of consanguineous marriage is very small; The probability of mental retardation is very high, because the genetic problem of inbreeding affects the fetus in the abdomen, so the probability of congenital mental retardation is very high.
Therefore, in order to the health of the next generation, we should actively respond to the national policy of good birth and good birth, and prohibit the marriage of close relatives.