G Matrix

I'm reading Derek Roff's chapter in Evolutionary Genetics: Concepts and Case Studies about quantitative genetics and the G Matrix. He revisits some of the territory covered in Evolutionary Quantitative Genetics, but his tone is strikingly pessimistic on both theoretical and empirical grounds. I'm still chewing over some issues, so for now I recommend twoposts on the G Matrix elsewhere. Also, this review covers a lot of G Matrix ground....