Consanguineous marriage affects generations

summary

We all know that close relative married couples, because they get more of the same genes from their common ancestors, are easy to make the recessive harmful genes that are bad for survival meet in their offspring (homozygous), so they are easy to give birth to children who are easy to get sick. Then, how many generations will be affected by close relative marriage? Let me explain it to you.

Consanguineous marriage affects generations

First, if there is a first-class gap between the first-class cousin and the second-class cousin, it means that the first-class cousin and the first-class cousin are intermarried, then the close relative index is 1 / 32, and so on.

Second, however, compared with non consanguineous marriage, the risk of second degree consanguineous marriage is 8 times higher; the risk of first degree consanguineous marriage is 31 times higher; the risk rate of brother sister intermarriage is 125 times higher than that of normal random marriage.

Third, Article 6 of China's marriage law stipulates that "direct blood relatives and collateral blood relatives within three generations are prohibited from marriage." Lineal consanguinity refers to the relationship between parents and children, grandparents and grandchildren, grandparents and grandchildren. Collateral blood relatives within three generations include siblings, uncle (uncle, aunt) and niece (daughter), uncle (aunt) and niece (daughter).

matters needing attention

Therefore, the two couples who are close relatives marry are very likely to carry the same recessive pathogenic genes, which are easy to meet in the offspring, and increase the incidence rate of inherited diseases. With the current population situation and medical level, in order to minimize the genetic defects caused by close relative marriage, it is stipulated that direct blood relatives and collateral blood relatives within three generations are forbidden to marry.