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Is there something wrong with the children born by close relative marriage

Is there something wrong with the children born by close relative marriage

For a long time, the law does not support consanguineous marriage. Men and women who are related by blood, no matter how much they love each other, should not marry together. The biggest harm of consanguineous marriage lies in the children. The children born are prone to high levels of genetic diseases and other problems. But is this really the case. Listen to Xiao Bian.

1、 Is there something wrong with children who get married next of kin

It's not necessarily a problem, it's just that the probability of a problem is much greater than that of other situations

For example, the probability of suffering from various defects is 1% or 0.1% for ordinary people, and 30% for close relatives. It's just a metaphor, not accurate data.

2、 Can't close relatives have children? What are the rules?

Direct blood relatives and collateral blood relatives within three generations are prohibited from marriage. This is formulated from the perspective of eugenics. Consanguinity, also known as consanguinity, refers to people with common ancestors in human groups. Lineal kinship refers to the 'vertical' blood relationship, such as parents and children, grandparents and grandchildren, grandparents and grandchildren, etc. Collateral blood relatives, such as brothers and sisters, cousins, cousins, uncles, aunts, aunts, uncles, uncles, etc., have common ancestors within three generations, that is, collateral blood relatives within three generations. Under normal circumstances, each person carries 5? 6 kinds of recessive pathogenic genes. However, due to the different types of recessive pathogenic genes carried by individuals, the probability of marriage parties carrying the same recessive genes is small. Therefore, such recessive genetic diseases are rare and the incidence rate is very low. However, it is different in close relative couples. Because they have the same grandparents, the proportion of recessive pathogenic genes passed from grandparents to their mother (or father) is exactly the same, which is far greater than that of couples with different grandparents, so the chance of meeting the two same recessive pathogenic genes is greatly increased. When the husband and wife just carry the same pathogenic gene, this kind of recessive genetic disease will show up and harm the next generation. Therefore, even if close relatives get married, they can't have children.

Heredity is caused by the same genes in the body. Due to the fact that couples married by close relatives carry more of the same genes, some genetic diseases can only occur in their offspring when their parents share the same 'pathogenic gene' and 'meet'. In the general marriage relationship, this kind of 'meet' chance is very few. But the situation of consanguineous marriage is different. The chance of meeting is obviously increased. Because they come from the same ancestor, they share more genes. One half of the genes are the same between parents and their children, siblings, grandparents, uncles, aunts, nieces and nephews. Among cousins, aunts and cousins, 1 / 8 had the same gene; among cousins, uncles, nieces and nieces, 1 / 16 had the same gene; among cousins, 1 / 32 had the same gene. The more genes are, the more chance the disease genes will encounter, so the higher the incidence rate of genetic diseases.