Lead
"People often don't attack each other suddenly for no reason, it must be something bad that happens between people, and they will fight each other. ”
When a paleontologist talks about the mutual aggression between organisms, he mentions that the mutual aggression between organisms may be due to the combination of factors such as competition for resources, territory, and opposite-sex pairing.
In the history of mankind, wars between men have led to a demographic crisis, and this demographic crisis has also puzzled scientists as to why the sex ratio of human beings is out of balance, with 17 times more women.
Scientists want to understand the intricate social structure of human society 7,000 years ago, and what caused the number of women to be 17 times higher than that of men.
1. Demographic crisis.
In the history of mankind, wars have been fought again and again, and these wars have often led to a sharp decline in the population due to conflicts of interest, but this has not made the struggle between men less combative, on the contrary, human beings have gradually learned to use weapons to make fatal blows, kill others, and make themselves survive, which also aggravates the loss of population to a certain extent.
7,000 years ago, the number of human beings plummeted, and this demographic crisis reduced the number of human beings from the original population to the brink of extinction, and in the face of this demographic crisis, the number of human beings was reduced by 90% in this demographic crisis, and the number of human beings fell sharply from a few million at that time to only a few tens of thousands.
In this demographic crisis, after human beings have gone through great suffering, human beings have reproduced many times, and the number of human beings has recovered to a certain extent, but after the end of this demographic crisis, the gender ratio of human beings has been out of balance, the number of human beings is less than half of the number of men, and the number of women accounts for the vast majority of human numbers.
After a lapse of 7,000 years, when scientists conducted a study, they found that in the population crisis 7,000 years ago, the diversity of the Y chromosome of males declined, and the genes of human beings were also reduced in this population crisis, and human beings miraculously survived in this population crisis, but the sex ratio of human beings was out of balance, and the number of women was absolutely dominant in the number of human beings.
2. Genetic bottleneck period.
After scientists found that the diversity of male Y chromosomes declined, they also speculated that the decline in genetic diversity of human beings may be related to the power struggle under the rule of the patrilineal tribe at that time, with the continuous progress of human society, human society has also entered the patrilineal period from the matrilineal period, and the social structure under the rule of the patrilineal tribe, his power is realized through patrilineal blood and blood relations.
In this social structure, the position of men is undoubtedly the most important, and women are like carriers in this social structure, and without the fertility of women, it is difficult for the patrilineal tribe to continue.
After human society entered the patrilineal period, patrilineal tribes also continued to multiply, but the social structure under the rule of patrilineal tribes also affected the inheritance of human genetic diversity to a certain extent.
In the social structure at that time, power was achieved through patrilineal blood, and when a man gave birth to an heir, the son's Y chromosome was obtained from the father's Y chromosome, so that he could also inherit the father's position, which also affected the genetic diversity of human beings to a certain extent, and if this phenomenon continued, then the genetic diversity of human beings would also be reduced on this basis, which would eventually lead to a decline in human genetic diversity.
When scientists were studying human genetic diversity, after they found that human genetic diversity was declining, they were also inferring that there might be a period of power struggle between the patrilineal tribes at that time, and this power struggle might be between the most powerful men in the tribe, and this competition would continue until the end of the population crisis, and this period would also be closed, and the genetic diversity of human beings would not be updated for a period of time, which would also be the reason for the decline in genetic diversity.
3. Impact.
If it was really because of the genetic bottleneck period caused by the power struggle under the rule of the patrilineal tribes at that time, this phenomenon would also cause concern to scientists at the time, because when humans are genetically reproduced, if human genes are not updated, it will take a while, but this period of time will also be a long time for the genetic diversity of human beings.
This period of time is also very dangerous for the survival of human beings, because when human beings adapt to survival, if the genetic diversity of human beings is insufficient, it will also have an impact on human reproduction, which is why scientists are speculating about genetic bottlenecks.
So what kind of impact does the reduction of human genetic diversity have on the survival of human beings, and the genes of human beings will continue to change and mutate in the process of continuous reproduction, which will also affect the survival and reproduction of human beings to a certain extent.
If the genetic diversity of human beings continues to decrease, the possibility of genetic mutation of human beings will be reduced, which will also make human genes become single, and it will be difficult for human beings to adapt to the changes in the living environment when they adapt to survival, which will also be a prominent reason for the end of human beings.
When the genetic diversity of human beings decreases, the reproduction of human beings will also be limited, and when women give birth to children, the sex of the children will also be limited, and if women keep giving birth to daughters, then human beings will also be limited in reproduction, and the number of human beings will be less and less.
epilogue
When human beings enter the feudal society and aristocratic society, it will also affect the diversity of human genes to a certain extent, because in the feudal society, there was polygamy in the aristocratic society, and this system would also lead to the inability of some men's genes to be inherited.
In the feudal society, there are differences in the status of men and women, this difference will also affect the genetic diversity of genes to a certain extent, the reduction of genetic diversity of human beings, will also have an impact on human reproduction, this phenomenon also exists in today's society, human beings also need to make certain changes when adapting to life.