In this video I provide a basic introduction to twin studies and heritability scores. I explain how a heritability score tells us about the role of genes in explaining variance in a trait. I also discuss some common errors and emphasize that heritability is about the role of genes in general, not about specific genes, and that it only tells us about groups of people, not individuals. I also discuss some hypothetical examples that illustrate how differences in environments can influence heritability scores.

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