In ancient times when science was not developed, people did not realize that the marriage of close relatives was not good for the offspring, many people in order to have a pure blood or fat water did not flow to outsiders, close relatives and close relatives married, the most famous case is the European Habsburg Dynasty, this family of people in order to maintain the purity of the royal bloodline, more than 100 years in inbreeding, resulting in offspring have inherited a variety of diseases, the face has a very obvious defect - the jaw is more prominent than the palate, some people call their protruding chin "Habsburg chin".
Close relatives marriage destroys the offspring not only looks but also intelligence, Chongqing's mother-in-law Li married her cousin at the age of 18, 5 children born are mentally retarded, intelligence is equivalent to 3 or 4-year-old children, modern science is so developed can not prevent close relatives from marrying and giving birth to mentally retarded children, why in the ancient times when science was not developed, it was rare to hear of cousins marrying and giving birth to mentally retarded children? In fact, there are three reasons for this.
One: Mentally retarded children are killed as soon as they are born
In ancient times, the mentally retarded child was regarded as an ominous symbol, and if anyone had a mentally retarded child, the neighbors would laugh at them for a lifetime, and the parents might be selfish, or they might not be able to raise a mentally retarded child who would only spend money and would not earn money, and drown them shortly after the birth of the mentally retarded child. In ancient times, there was no monitoring, parents killed mentally retarded children on the dark night of the moon and buried them, basically no one found out, so that everyone thought that close relatives would not give birth to mentally retarded children when they married.
Two
Close relatives have a low survival rate
Children born of close relatives are 10 times more likely to have disease than children of non-close relatives, and the number of children suffering from leukemia is 14.5 times higher than that of children of non-close relatives, so it is difficult for such children to live to adulthood even if their parents do not kill, the survival ability of children with intellectual disabilities is low, the life expectancy of ancients is low, in case the parents die young, it is difficult for these children to live. Ancient medicine was not developed, and doctors were helpless in the face of difficult diseases such as mentally retarded children, and could only watch these children die.
Three
Cousins and cousins have been in a relationship for three generations
Chinese relatives network is very complicated, cousins and cousins may not be very close relatives, may be cousins who can't be hit by eight rods, such relatives have a smaller chance of carrying the same disease-causing gene, the probability of children getting sick and mentally retarded is also smaller, and children with intellectual disabilities are not so frequent.
The probability of marriage between close relatives also gives birth to geniuses, the founder of evolution Darwin is the product of the marriage of grandparents' close relatives, and later he himself married his cousin's close relatives, giving birth to 10 children, 3 died before adulthood, three of the remaining 7 children were infertile for life, and the rest of the children were a lifelong disease even if they had reproductive function. Darwin's example tells us that the marriage of close relatives may give birth to a genius like Darwin, or it may give birth to a sick and disabled child who cannot have children, exactly like gambling, what is the outcome after betting is not decided by man, Darwin has thought of ways to cure unhealthy children, but everything is in vain.
Many countries prohibit the marriage of close relatives, and the Marriage Law promulgated by the mainland since 1950 prohibits the marriage of men and women with a common ancestor within three generations. Japan, next door to China, has not banned the marriage of close relatives until now, and today's Japanese imperial family still marries for pure blood close relatives, and the final result is that there are few men in the imperial family and women are not good-looking.
The ancient Chinese royal family also likes to marry close relatives, but with the change of people's ideological concepts and the popularization of science, this phenomenon is becoming less and less, and everyone must continue to maintain it, maintaining the unity of a family is not by blood, but by sincerity, only by paying a piece of sincerity can they exchange it for the sincerity of others, and the family will become more and more reliable.