The Molecular Evolution of Animal Reproductive Tract Proteins: What Have We Learned from Mating-System Comparisons?
Figure 1
Three types of rate variation. In each panel, branch lengths are proportional to the rate of protein evolution. (a) Amongst the focal species A, B, C, and D, there is no variation in the rate of evolution. (b) Two rate classes. A and D share a rate, and B and C share a faster rate. In the current context, B and C represent polyandrous species, while A and D are monandrous. (c) Species-specific rates. Different rates of evolution are estimated for every lineage.
