Evolution continues to this day: how a person changes in the process


Medicine of our kind can not be solved from natural selection.

Evolution trivaє dosi: yak zmínyuС "tsya people on the process

The ability of modern medicine to support the lives of people on the planet causes the evolution to stop, writes UNIAN.

After all, quality health care becomes an obstacle to key evolutionary power, extends people's survival and increases their chances of transferring their genetic code to the next generation. But if you look at the level of the evolution of our DNA, you can see that the development of the human species did not even stop, but even accelerated.

Lawrence Hurst, a professor of evolutionary genetics, writes about this on Newsweek.

Evolution is a gradual change in DNA species with a change of many generations. This can occur with natural selection when some of the properties caused by mutations help the body survive and multiply. Such mutations are most often transmitted to the next generation and become more common among the population. And gradually, the properties they cause become an integral part of the whole group. If you look at global DNA research, we will see evidence that natural selection has recently changed and continues to do so. Although modern medicine provides humanity with numerous causes of death, it continues to develop in countries with a developed public health protection system. Those who survived the epidemics of infectious diseases migrate the natural selection, tolerate genetic resistance to their offspring. Our DNA proves this because people have become more resistant to deadly diseases, such as Lassa fever and malaria.

Natural selection in response to malaria is still taking place in regions where the disease is still common. People are adapting to the environment. Mutations allow people to live on a higher level. Among the inhabitants of Tibet, Ethiopia and the Andes are quite common. The spread of gene mutations in Tibet is probably the fastest change in humans over the last three thousand years. The rapid spread of genes by mutations increased the oxygen content of the blood of Tibetans, allowing them to survive in high-mountain regions and give healthy offspring.

Diet is another source of change and adaptation of the human body. DNA Eskimov proves that their people survived in the Arctic conditions due to the fact that their bodies adapted to the diet rich in animal fats. Research has also shown that natural selection has caused a mutation that allows adults to produce lactose, an enzyme that breaks down sugar in milk. And that's why some groups of people can drink.

More than 80% of Northwestern Europeans can drink milk. But in East Asia, where it is often not enjoyed, intolerance with lactose is normal. The scientist acknowledges that humanity can adapt to the use of products that are harmful today. However, despite all these changes, natural selection today affects only 8% of the human genome.

Source link