When it comes to marriage between close relatives, whether in ancient times or in modern times, the secular vision always has a certain curiosity. According to scientific arguments and actual conditions, the offspring born by marriage between close relatives will always be born with some physiological defects, commonly known as "crooked melon and cracked jujube".
The unaware consequences of inbreeding are the "curse" of genes and the last line of defense for inbreeding. However, inbreeding of animals is not uncommon, and there is little to hide. Why is it that only humans have the problem of inbreeding? Hasn't science also proved that humans also evolved from animals?
What relationships are included in inbreeding
The reasons for consanguineous marriage include the feudal superstitious idea of "kissing and kissing" and the phenomenon of changing relatives, as well as the local customs and habits of some ethnic groups. Of course, premarital testing is not widespread, and it is not clear whether the partner is related to the free love of men and women.
Inbred marriage is also easy to cause confusion about family kinship status, and I am not sure what to call it! The mainland has always been a Confucian ideology that attaches great importance to ethics and morality.
In 1980, the Marriage Law of the People's Republic of China clearly stipulated that it was forbidden for lineal blood relatives and collateral blood relatives within three generations to intermarry with each other, including the relationship of adopting children. Even if the marriage certificate is obtained, once it is verified, it is an invalid marriage and it is an illegal act.
Immediate family members include: parents and children; grandparents and grandchildren; Great-grandparents, great-grandparents and great-grandchildren. It is absolutely and absolutely forbidden to marry, nor to have offspring.
The three generations of collateral relatives include: siblings, cousins, cousins, uncles and nieces, aunts and nephews, uncles and nieces, and aunts and nephews.
The reason why close relatives can't love each other and produce the crystallization of love, in addition to violating ethics and morality, the biggest problem is that the offspring born will be. The closer the blood relationship, the more prominent the condition becomes, and the defective gene can even be passed down from generation to generation.
One of the very important factors in the ancient why there were so many inbred marriages is that
What are the dangers of consanguineous marriage?
Human genes come from parents, both of which account for half of the total, and both parents are not related by blood, even if one parent has a harmful hereditary gene passed on to the child, but the other party does not have such a gene, then the probability of harmful genes appearing is very small. The marriage of consanguineous relatives is different, because they all carry harmful recessive genes, and the probability of children developing congenital genetic diseases will be greatly increased.
In the long history of human survival and reproduction, many ancestors have secretly tasted the forbidden fruit, proving that some love will not be recognized by the rules of nature. There is almost no inheritance of offspring after the marriage of direct blood relatives, and they are all congenital premature death or various physical defects that do not live long. However, after the marriage of the cousin blood relatives, the probability of disability of the offspring born is not so high.
It's as if Darwin, the father of evolution, married his cousin, and the survival rate of 10 children born is proof of this, four normal but limited lifespans, three premature, and three disabled. Compared with the present, the medicine of the ancients was not developed, and the life expectancy was not long.
The pharaohs of ancient Egypt liked direct marriage for the sake of pure blood, so there were almost no offspring, and due to the problem of genetic "curse", one was born and one died.
And the ancient emperors and princes and nobles of the mainland also had many cousin marriages.
Of course, there are also the emperors of Japan, the Habsburgs in Europe, the Colt family in Australia, the Rothschild family of the Jews, etc., all of which belong to the alternative type of inbreeding by marriage.
The harm of consanguineous marriage is first reflected in the physical integrity, because even if the inbred marriage is pregnant and has offspring, the fetus is born prematurely and dies prematurely, and the miscarriage rate is quite high.
The second is genetic decline, because even if you are born successfully, you will grow up, but after you reach your twenties, the rate of aging accelerates, and your lifespan is very short.
There was such a Habsburg dynasty in medieval Europe, and there was such a strange rule. The offspring born are almost all deformed, and the survival rate and life expectancy are not high, and each family member is characterized by a "shoehorn face".
Suppose that back to the time of Adam and Eve, if there were only one male and one female left on earth, in addition to direct blood inbreeding, the inbreeding of cousins would not necessarily lead to complete extinction, then in order to reproduce more offspring, it would only be more cruel.
It seems that a man and a woman, given enough time, can indeed create a nation, and this is definitely not a joke.
。 Offspring are born with congenital diseases, marked by physical disability and intellectual disability.
This disease occurs because of a problem with the genes in the parents, and its essence is mutation. Doctors usually recommend that they get pregnant again, but if the parents insist on giving birth, and they can't accept it after giving birth, and want to kill them, it is an illegal act to deprive others of their lives.
The genetic complexity of human beings is among the best among earthlings, which indicates that the more complex the genes, the more difficult it will be to arrange and combine them to produce the next generation.
The strengths and weaknesses of genes will be infinitely magnified, and the direct manifestation is that they are smart or stupid, which can be understood as excellent genes will be more excellent, but they will also be mixed with failed combinations. If genes cannot be found to be the same match and are lost, it will lead to physiological defects in the next generation; There is also a situation where genetic mutations directly affect the development of children into malformations.
The causes of such congenital diseases are: That is, the carriers of deformed or recessive harmful traits will be manifested together and then in the next generation.
Current medical studies have found that different base pairs contain different functional effects. Scientists have proposed to study each of the 3 billion base pairs to figure out what role they play in their genes.
The results of this project are good, which means that humans can control the strengths and weaknesses of genes and modify them, which would be terrible if they were used by people with ulterior motives.
In real life,. Like the Maori people in New Zealand, there were only a few hundred women and a few men in the tribe, and now there are more than 700,000 people, as do people in other tribal areas.
Why animals can be inbred
In the history of human civilization, it has always been believed that animals should also avoid inbreeding mating as much as possible. But after hundreds of scientific studies and demonstrations by zoologists on hundreds of animals,
This means that animals rarely try to avoid mating with relatives, and they don't care if their partners are brothers, sisters, cousins, or unrelated individuals.
The law of survival in nature is the survival of the fittest, the first few generations of animal inbreeding, need to produce a large number of individuals, and then carry out the screening of survival rate, often congenital diseases are particularly serious, will be automatically eliminated, normal and healthy can continue to survive and continue to reproduce, as long as the environment is suitable, fertility problems are not a problem.
This is one of the reasons why so many animals will go extinct.
For example, the Australian rabbit, where did it come from the family concept and ethics, and there is no genetic disease that cannot be solved by regenerating a litter. You can't win by giving birth to a baby.,There's no time to care which rabbit cub lacks arms and legs.。。
In addition to rabbits, cats and dogs, pigs, cattle and sheep, etc., almost all animals are like this, will carry out inbreeding, and those who can survive are survival of the fittest.
The same is true for the cultivation of many animals and plants, except for the genetic differences in the first few generations, the later ones are all close to inbreeding, such as watermelons, potatoes, rice, purebred cats and dogs, and so on.
But there will always be a few individuals who will survive, through generations of artificial selection, continue to breed inbreeding for more than ten generations, almost all of them are normal excellent breeds. This is possible with the cultivation of plants and animals, but not with human beings themselves, because the practice is too cruel and it is necessary to constantly weed out defective people.
Human beings are also a kind of animals, and theoretically they can also create the appearance of being rich and handsome, but when there is a problem of genetic disease, they must be castrated or sterilized out of humanitarianism, and they cannot be allowed to reproduce.
Hitler had made such a crazy plan for the "fountain of life", but unfortunately Germany was defeated before the first superrace could grow up.
To sum it up, you know
Some brain-opening netizens said that close relatives can marry without reproducing offspring, just enjoy the process, just like the Dink family. Well, it is true that theoretically it is possible to do this, but the marriage law does not support such a union.
Humans are emotional animals with high intelligence and have a more cautious way of behaving when it comes to giving birth to offspring. Even if the child is born with a congenital disability or intellectual disability, he will be left behind by medical means due to various factors.
Even if it will be pointed at by people, even if it is a psychological injustice to the child's growth. The concept of human beings is that after the child has been born, there is no right to deprive the child of his life, which is the moral bottom line.
In general, inbreeding destroys a race in an alternative way. It's like a plate of apples, if one of the apples is rotten and not cleaned up in time, over time, it will infect the other apples, and the result is that the whole plate of apples is completely spoiled.
What do you think about inbreeding?