A new paper, co-written by me, Morgan Kelly, and (former Rice undergrad) Francie Hessel is now up on TREE’s website: http://www.sciencedirect.com/science/article/pii/S0169534716302427. In this paper, we focus on the genetic reasons for correlations between traits, including tradeoffs. Why are some traits correlated, but not others? Why are some traits positively correlated and others negatively correlated? How do trait correlations evolve and/or influence evolution? How many genes should produce trait correlations?
We review recent knowledge about how genetic variation produces trait variation and puzzle through the implications of these recent findings for the evolutionary genetics of trait correlations.
I learned a lot while writing this paper and it was great working with Morgan and Francie. Comments welcome as always.