Dogs evolved from what?

Do not know when, we would like to compare dogs and wolves. We are the most common, and the wolf of the most similar, and perhaps not "dogs" is none other than the. From the childhood time, we would like to discuss whether it is powerful wolf or large dogs worse, for those big dogs in order to Savior who SHOPPING ferocious wolf's story has always been infatuated with them. But how did this come from a dog, dogs and wolves And how about the source of what it?

The dog's origins can be compared with the pyramids as a match for human civilization in the history of six major mysteries, while the dog is a legend of the origin of the standards: human dog is found to be a useful partner, so put it into his own family. "Dog and human settlement at the same time a" this argument has gained, but the discovery of genetic research shows just the opposite.

1.4 million years ago, dogs and wolves are "one people", 1.4 million years ago, they parted ways. "Science" magazine published an article in the dog mostly from wolves in East Asia15000before, this may be due to East Asia Timberwolves shape smaller, more easily domesticated reasons, and then spread to the whole of Asia and Europe, As human beings, after 14000-12000 million years ago participated in the colonization of the New World.

Although the reasons for the emergence of the dog has not been conclusive, but some scientists believe that humans adopted a young wolf, and attack less, but also good at a beggar of the young wolves will be in the predominance of natural selection. Some scientists said, the dog domesticated their own, as they adapt to new ecological niches - the human garbage heap. Less likely to run away human canid scavengers, then in those niches, survive, and their descendants are more docile. Biologists Leimengdeke Ping Jie said: "At that time all the options are actually only one - is that we can eat in the human in the vicinity."

The latest research shows that differences in mitochondrial DNA, the dog's origin and evolution of far earlier that human breeding dogs should be on Shisanwannian ago, earlier than the cattle and sheep rearing chickens, ducks and other domestic animals and poultry, in all animals and people had each other the earliest animals. United States College of Charleston dog expert Norrish Noonan said: "We have always thought that a long time ago in East Asia began a series of wild animals, domesticated activities. In fact, the history of their domesticated long than we thought it would be much more at least have 10 years history. At the time, there may be a 'raw dog' to seek, to meet the furnace of human warmth and comfort provided by the diet, as a protector of human, suppliers and friends, in turn, this Early looks like wolf hunting of animals is to help mankind. "

U.S. hungry dogs Hai Ohio Research Institute, Deborah La Linqi, said: "When this 'primitive dog' has been domesticated, the owner wherever they will now where to go. As a result, for example, when humans migrated to the Americas, these docile dogs also follow the human migration to the Americas. dog tame the history of ancient than we thought it would be much more, they are almost human at the same time coming out from the cave. In the process of coexistence, human recognize that they can be by breeding dogs to work for them, and two loyal dogs give birth after mating dogs are still loyal, but also can still planing pits, grazing, hunting, or attack. "

So why are there so many breeds of dogs, and the body looks have clear difference? Deborah La Linqi explained: "Different breeds of dogs was created because in the distant past a certain time period, human beings are different purposes in accordance with them domesticated, so as to provide their own specific service. Functional factors that can often affect the the evolution of species, which is why dogs are often the reasons for the black color. "

In December 2005 published in the latest issue of "Nature" magazine, the American scientists published canine genome shows that the human genome more than 300 more than the dogs; dog has more than 360 kinds of genetic diseases, the same as with humans. Due to the long-term relationship between selective breeding, and many breeds of dogs can easily suffer from the same genes with human diseases such as cancer, heart disease, deaf, blindness and autoimmune nervous system diseases.

Although all of the dogs 99% of the genes are the same, but the remaining 1% of the genetic differences have decided against the dog species. From the genetic perspective, it is precisely because different types of dogs on the huge differences in appearance, as well as their common genetic basis in order to conduct genetic research dogs can become a good target. At the molecular level, between wolves and dogs, there is little changed: the composition of their DNA is almost identical.