All Human Behavioral Traits are Heritable

JayMan's Blog

EDIT, 5/30/15: [Post updated with results of new meta-analyses of behavioral genetic studies. See below!]

Edit, 1/3/13:[Post updated to reflect additional information provided in the comments. See below and see the comments.]

The time has come for a little reminder of the First Law of behavioral genetics. In my final post of 2012, I will discuss this extremely important law in depth. As we may recall from debates with creationists about the reality of evolution, scientific “laws” are comprehensive facts of nature that have the virtue of being able to be expressed in a few sentences, typically one or two. The three laws of behavioral genetics are no exception:

  1. First Law. All human behavioral traits are heritable.
  2. Second Law. The effect of being raised in the same family is smaller than the effect of genes.
  3. Third Law. A substantial portion of the variation in complex human…

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