Linkage disequilibria between preference and trait alleles. This figure displays the linkage disequilibriabetween preference and trait alleles in the single preference/trait (two locus) and two preference/trait(four locus) models. 4a shows linkage disequilibria where the cost of competition=.1, and α=3; under these conditions preferences only fix when two are evolving simultaneously. 4b shows linkage disequilibria where the cost of competition=.1, and α=5; in this case, both a single preference/trait pair and two preference/trait pairs can evolve to fixation. In both scenarios, the linkage disequilibrium between preference and trait is greater in the 2 preference model (black dashed line) than the 1 preference model (solid gray line).