many scientists concerned about the issue: "Stop if the evolution of man"?Most of them believe that the answer should be yes.Indeed, if we consider the process of natural selection, is it man can evolve completely conquered nature and ability to feed themselves and their children?And given recent advances medicine, all doubts disappear - it reached its perfection.
But this attitude has its weaknesses.Stealth does not mean absence.Modern human evolution - the process is rather slow, so it is very difficult to track in real time.Moreover, the assumption that the development of real estate leads to the conclusion that contradicts the results of the study of the human genome.
simplest meaning of the word "evolution" states that this process of change in allele frequencies in a population over time.Most of this kind of change is the substitution of one allele other under the influence of natural selection.To determine how human evolution is moving enough to find any signs of change in the frequency of alleles in the genome.
Recent studies have allowed to define some of the most striking examples of the evolution of modern humans.
first - this is so-called altitude sickness.The peoples who settled in the mountainous areas of the world, faced with insufficient oxygen in the air.Such deprivation leads to fatigue, dizziness and insomnia.In severe cases, the consequences are irreversible - pulmonary edema and subsequent heavy death.And acclimatization can remove only part of the symptoms.
Studies have found that indigenous Tibetans adapted to existing conditions in the form of lack of oxygen.It was found that most of Tibetan blood oxygen saturation of 10%, compared with ordinary people.This feature is inherited, so that you can safely put forward the assumption that it depends on a single gene.
Another striking example is lactose intolerance.It is a carbohydrate that is found only in the milk of mammals.It is absorbed in the human body using special enzyme - lactase, which is produced intensively in the first year, after which the synthesis of the substance is on the decline.Most of the adult lactase is not synthesized, so almost no lactose digestible.
Surprisingly, American Indians, Australian Aborigines, the inhabitants of South-East Asia and Southern Africa are suffering from drinking whole milk.It causes bloating, diarrhea, cramps, vomiting and nausea.At the same time they can eat dairy products, as the fermentation process breaks down lactose.
ability to digest lactose in adulthood man acquired on two different continents - Europe and north Africa.Thus they have arisen independently of one another and occur in different parts of the genome.This double mutation has become a reliable sign that the evolution of man continues.
Special attention should be paid to the problem of AIDS.The pandemic of the disease, which began in the 80s, has become one of the major demographic factors at the moment.Almost. 40 million people suffer from this disease, with the peak of the epidemic falls on southern Africa, where about 25% of infected adults.
were passed many stages of human evolution - but the key one is the natural selection.That he was one of the factors of the emergence of AIDS, since it implies a certain mutation processes that ensure protection against the disease.And, most likely, over time, in the human body formed certain compounds that can effectively deal with this incurable disease.
origin and evolution of man took more than a thousand years.During this time, we have increased the volume of the brain, the facial features have changed, we have to walk straight, learned to talk.Every day we develop, acquire new skills and abilities to effectively fight the disease and try to survive in a complex world, so we can not say that evolution has stopped, it is just a little slow its course.
