The long river of history is running endlessly, there are calm waves, there are also waves, let Xiaobian take you into history and understand history.
In the thinking of the ancients, children inherited the blood of their fathers and were not closely related to the blood of their mothers. But the ancients also knew that people with the same surname could not marry each other, because the blood shed by the same surname was the same, a father was equivalent to a cousin, such genes would be very similar, if combined, the probability of the remaining offspring suffering from genetic diseases was very large.
But the cousins are different, the cousins and sisters are not the same surname, that means that the ancestral origin is different, that means that you can intermarry, after intermarriage, kiss and kiss, but kill two birds with one stone. This statement seems absurd now, but in ancient times it was accepted by everyone. However, in ancient times, such a phenomenon was rarely seen, and what was the reason for this, which was nothing more than these three points.
The first point: in ancient times, it was generally polygamous, men could take concubines, in ancient times, the so-called cousins, cousins actually did not have the so-called blood relationship at all. Maybe a man's cousin was born to a concubine, so intermarriage between them does not affect the offspring.
The second point: in ancient times, there were more children born, although the genetic similarity of children born of the possibility of problems is relatively high, but the probability is high, it may also be born five or six, and only one has a problem. Judging from the medical conditions at that time, this is also very normal.
The third point: In ancient times, due to the limitations of living standards and medical standards, many problematic children were aborted before they could be born. If there is a problem with the child born, according to the ancient clan system, the execution of children who are born inadequate is also allowed.
Therefore, at that time, close relatives married, if it is a child who is born insufficient, it is possible to miscarry early, so there are fewer mentally retarded children born.
Well, today's sharing ends here, and we'll see you next time