In fact, until the 1980s, it was quite obvious. The fact that the characteristics of the population of Northern Europe - blue eyes and blonde hair - the so-called recessive traits. When crossing the blue-eyed and fair-haired and dark-eyed dark-haired with a dominant win signs of dark hair. If the population of Northern Europe was replaced by newcomers from the Near East, the people of Germany and Scandinavia would have looked very different. South and west of Europe - yes, the population changed there. And in the north, and after the "Neolithic revolution" continued to live the descendants of its ancient population.