From Genes to Culture

I was reading the chapter when I came across the section on how changes in breeding and heredity are studied. First of course they mentioned the Kenyan marathon runners and how their abilities are based on heredity and environment. I found this easy to relate to because most people today know how amazingly well runners from Kenya perform at the Olympics. The. They talked about studying twins. Ive heard of these cases do often it wasn't that hard to follow. Heritability is still a term I have a hard time understanding, for now.