Вот, что я нашла: "Furthermore, scientists believed for a long time that personality, intelligence, health, or other traits are influenced in certain percentages by nature (genes) and environment (for example through a nature/environment relationship of 60/40 or 50/50). Based on recent studies, the relationship between nature and environment in determining the presence of certain traits is different. Some genes become active only when the person is exposed to a certain kind of environment. Also, according to a new field of research called epigenetics, our DNA is coated with a "second code" that can change during our life as a result of a certain diets, chemicals that we are exposed to, and the way we behave. This means that humans are influenced by DNA, while the DNA is influenced by humans. (9)"Остальные статьи об этом же, только речь идет об аутизме и алкоголизме.