People who like dogs may know that the teacup dog is the smallest dog in the world, and for this cute dog that can be held in the hand, the average person is confused by its cute size. And with more and more people learning about teacup dogs in recent years, this kind of dog has also entered the field of vision of many people.
Even many boys think that raising a teacup dog can better communicate with girls, so there are more and more people raising teacup dogs, but have you ever wondered how such a cute teacup dog came from?
The teacup dog is small and cute, and is the cute pet in the hearts of many people in modern times. Only dogs weighing less than 4 pounds and not more than 8 inches tall are qualified teacup dogs. Moreover, the teacup dog is not a species, it includes 7 kinds of dogs including teacup VIP, teacup Chihuahua, teacup Hiromi, etc.
Teacup dogs, as the name suggests, are dogs small enough to be kept in a teacup, the world's first teacup dog came from the United States, when it was due to an accident, an ordinary dog because of genetic mutations, the size of the body was maintained in a particularly small state. But humans are crazy because of this, and everyone thinks that this small dog is very cute.
However, it is this madness of humans that has led many businessmen to seize the opportunity to start a large number of research on dog genes. In the 19th century, the teacup dog, a breed of dog, officially began to spread to the world. Among them, people in Japan and South Korea spread the most rapidly, but humans only saw the cuteness of the teacup dog, but they could not see the pain behind the dog.
In the eyes of businessmen, the benefits are greater than everything, and the pursuit of teacup dogs by human beings is exactly what businessmen want to see. In order not to let the dog grow up, they will give the dog a shrinking needle, slimming injection, only let the dog eat food to maintain physical function and many other acts that destroy the dog's body, although this creates a teacup dog, but their life span is very short. But the merchants discovered a new approach.
With the advancement of genetic technology, in order to make the teacup dog live longer, the businessman has developed a new way to cultivate the teacup dog, such as inbreeding between dogs, screening out genetically problematic breeds, and even sometimes directly producing dog embryos that have not fully developed, the consequence of this is that the dog is stunted, the congenital resistance is weak, even if the life expectancy is extended, it is only a few years, if the businessman should be condemned for injecting the dog, then this practice is the loss of human nature.
So, is it against ethics for businessmen to force dogs to mate with close relatives?
Inbreeding is a taboo topic between humans, although in ancient times people advocated close relatives marriage, that is, the so-called close relatives plus parents, but with people's understanding of biology, it was found that the offspring born of close relatives marriage are very easy to contain various genetic defects, so humans began to resist close relatives marriage.
But there are still some countries where the royal family advocates the marriage of close relatives, the purpose is actually for the purity of the bloodline, and it has to be said that sooner or later these feudal ideas will harm themselves.
The so-called marriage of close relatives refers to the marriage of people who have common blood relations within three generations or less. There are many similar genetic factors between the two sides, if a gene is inherited in an autosomal recessive way, the two parents are set to Rr, and their children are very likely to have the disease because of the mutation homozygotes, that is, rr, and the incidence rate can reach 1/4.
Therefore, in order to avoid the occurrence of this phenomenon, it is not allowed to marry between close relatives, because this is also a violation of ethics and morality.
In fact, whether it is animals or plants, there are artificial things involving inbreeding, because inbreeding is one of the important ways to choose good livestock and plant parents. Hybrid rice, for example, selects excellent varieties by hybridizing offspring with parents, because inbreeding can not only improve the incidence of offspring but also improve homozygousity.
When normal animals and plants mate with inbreeding, the offspring are mostly characterized by symptoms such as decreased adaptability and slow growth and development. However, humans can control the mating degree of animals and plants through artificially selective inbreeding forms, and enhance the diversity of selection and elimination. While homozygotic dominant excellent genes, it also homozygotes recessive inferior genes.
Most importantly, the inbreeding positioning between animals and humans is different, and only if there is blood relations within six generations, it belongs to inbreeding. Therefore, there is no problem in screening excellent genes for humans, for example, hybrid rice has solved the food problem of all of China. But it doesn't work on a teacup dog.
Two dogs of normal size, giving birth to a teacup dog, this is not reasonable. If the genetic type related to body type is autosomal recessive, then the gene of the teacup dog is aa, and his parents are Aa, but through the artificial modification of the gene, only the parent's A gene is inherited, and each fetus is an aa gene. And there are many defects in this gene, such as a short lifespan.
In this case, artificially allowing animals to mate is actually a kind of harm to them, so the act of human beings letting animals and plants mate is not against ethics, but must be based on a beneficial basis. The teacup dog is cute, its life is very limited, maybe this little life should not exist in the world.