In other words, how natural selection
plays an important role, the mutation frequency was significantly increased in certain populations. The investigation of genetic markers in individuals archeology and the surviving humans, scientists found differences in genes related to hair, skin and eye pigmentation.
According to Sandra Wilde, prehistoric European people consistently have darker skin than the current descendants. Dark phenotype seemed to take a big role during the evolution of hundreds of thousands of years. All ancestors are thought to have a dark pigment, but changed slowly over the last 5000 years as a man who migrated into northern latitudes.
The research team found a wide range of genetic variation in particular pigmentation. At first they did not expect to find the natural selection plays a fundamental role in the pigmentation changes during the last few thousand years. Selection results identified, comparable with the resistance to malaria and Lactase. It was a natural adaptation to the decreased levels of sunlight in northern latitudes.
According to Professor Mark Thomas of UCL, most people in the world get vitamin D in the skin from exposure to UV light, but in northern latitudes, dark skin is considered less efficient. Very likely from hair and eye color serves as evidence to suggest group affiliation, and finally play a role in mate selection.
Sexual selection usually happened in animals and may also have been one of the driving forces behind human evolution over the last few thousand years.
Altered in the human genome is the result of population dynamics, as happened in the migration, but the genetic changes due to natural selection is an exception. At the same time, there has been a tendency lactase, which is the ability to digest the sugar in milk consumption, and pigmentation genes was more dominant in natural selection over the last 10,000 years or more.