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First of all, this is consanguineous marriage!

In modern times, a large number of data prove that the incidence of dementia children is 150 times higher than that of non-consanguineous marriage, and the neonatal mortality and disability rate are more than three times higher than that of non-consanguineous marriage. It has also been reported that the number of children married by close relatives who died before the age of 20 reached 13.9%, while the number of children married by non-close relatives was only 1.7%. A large number of facts have proved that consanguineous marriage is not good for future generations and should be banned!

Therefore, Article 7 of China's new Marriage Law clearly stipulates that lineal blood relatives and collateral blood relatives within three generations are prohibited from getting married. Close relatives refer to people who are related by blood, more precisely, people who are not too far away from their ancestors, usually dating back to three generations ago. Why does consanguineous marriage increase the incidence of genetic diseases in offspring? This should be explained from the perspective of genetics. The inheritance of organisms is accomplished through the transmission of information by genes, which are the material basis of inheritance and passed on to offspring through germ cells (sperm and eggs), so that parents' traits can be expressed in offspring. Each of us has about 50,000 genes, half of which come from our father and the other half from our mother. That is to say, there are 1/2 genes that may be the same between each child and parents, so there are 1/2 genes that may be the same between brothers and sisters. But there are 1/4 possible similarities between grandchildren and uncles. Similarly, there is a possible similarity of 1/8 between cousins. The pathogenic genes of some genetic diseases are recessive. If one parent carries this gene and the other parent does not, the pathogenic gene can be covered up, so the offspring will not get sick. Only when both husband and wife carry this recessive gene will their offspring get sick.

The latest scientific point of view

Experts in Western Australia, Australia are now challenging the problem that human inbreeding will give birth to unhealthy babies. This highly controversial topic has been puzzling people. In the past, people always thought that inbreeding would give birth to deformed babies, who suffered from many diseases, such as heart disease, mental retardation, deafness and even blindness. In 200 1 year, a scientific report published by an authoritative magazine in Australia claimed that the probability of a cousin getting married and giving birth to a deformed child was three times that of a non-relative. However, Allen Bito, a professor of comparative genomics at Murdoch University, has spent 30 years studying this topic and found that most of her cousins are healthy.

In Western Australia, Australia, about 500 couples get married through cousins. Professor Allen came to the conclusion through research: "In western culture, there is a general idea that cousin marriage leads to genetic tragedy, but a large number of facts have proved this idea wrong. Cousins can also give birth to healthy babies. "

Professor Bito conducted a survey in 1 1 countries, and found that the probability of giving birth to a deformed baby was 2%, while the probability of giving birth to a deformed baby by a close relative only increased to 4%. He also found that the infant mortality rate of close relatives is only 1.2%, which coincides with his research in 2002: the probability of a cousin getting married and giving birth to a deformed baby is less than 3%. This question triggered a heated medical debate at the medical seminar of the Royal Society of East London. Some researchers and politicians claim that in Britain, consanguineous marriage can lead to very serious consequences, and their children may be deformed or even die prematurely. The opponents represented by Professor Bito spoke: "As for the genetic tragedy of marriage, I think it is more related to excessive drinking and smoking." Many famous people, such as Einstein, Darwin and Hitler, were married between cousins. Cousin marriage is common in some countries, such as Pakistan, South Asia and Middle East countries.

In this debate, a doctor agreed with Professor Bito very much. He claims that there is only a 4% chance that cousins will have baby defects when they get married, which is nothing in genetics, so don't worry about genetic problems.

Professor Bito said that it is wrong to say that cousin marriage is extremely rare. In fact, in many parts of the earth, cousins get married more frequently. The population of these areas adds up to more than 654.38 billion, and about 20% to 50% of marriages there are related by blood. Professor Bito believes that as more and more immigrants enter Australia, more and more cousins will get married. In view of the large number of marriages between cousins, Bibi Tuojiao calls for further medical research on this issue in order to better explain this mystery!

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