Children born to consanguineous marriages may not necessarily have problems, but the probability of inheriting recessive genetic diseases increases compared to offspring who are not related by blood. Children born from consanguineous marriage are likely to inherit the same genes from a common ancestor and pass them on to their offspring, increasing the risk of developing recessive genetic diseases.
1、 Reasons for problems with children born from consanguineous marriages
When both spouses carry the same recessive gene inherited from their ancestors, the offspring will develop the disease. Therefore, consanguineous marriage increases the risk of developing recessive genetic diseases, such as albinism and congenital deafness; Cerebellar malformation, phenylketonuria, galactosemia, etc; It can also increase the incidence rate of polygenic genetic diseases, such as hydrocephalus, spina bifida, anencephaly, schizophrenia, congenital heart disease, epilepsy, etc.
2、 Which three generations do close relatives refer to
Chinese law prohibits marriage between close relatives within three generations. Starting from oneself as the first generation, counting upwards, parents are the second generation, and grandparents and great grandparents are the third generation. The resulting three generations of collateral blood relatives include:
1. Brothers and sisters who are related to their parents. Including full blood sisters of the same father and mother, half blood sisters of the same father and half blood. Although brothers and sisters with different parents are also called brothers and sisters in name, they are not related by blood.
2. The collateral relatives of grandparents and maternal grandparents, including uncles, aunts, nephews, nieces, uncles, aunts, nephews, and nieces.
3. Ancillary relatives of the same generation, including cousins sisters and sisters, who originate from grandparents.