Bloggingheads.tv: ScienceBloggers Razib Khan and Jake Young

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A recent post by Megan McArdle on her Atlantic blog about the heritability of obesity prompted a discussion on ScienceBlogs about the often confused meaning of heritability. As Razib explains on Gene Expression, "Heritability is the proportion of trait variance within the population explainable by…
I have been meaning to talk about this story, but I have been busy. A study in Nature looked for genes linked with "common" obesity (more on that in a moment), and it was one of the first to link genes to the disease. Turns out several are genes expressed in the brain: A genetic study of more than…
So on my return to regular Scienceblogging, I see that Mike the Mad Biologist and Razib are taking exception to a point made by Megan McArdle in the Atlantic. McArdle observes that the heritability of weight is quite high - almost as high as the heritability of height: Twin studies and adoptive…
In my "Atlantic article on the genetic roots of stable-versus-reactive temperaments, I noted that the key gene variants linked to these traits appeared to have developed over only the last 50,000-100,000 years -- a short time in evolutionary time. That same idea is developed in Cochran and…