FIGURE 3 Genetic mechanisms of single traits driving divergence. Disruptive selection acting on a mating cue (e.g., colour pattern or body size) targeted by a preference locus elsewhere in the genome ('classic magic trait', after Servedio et al., 2011) results into assortative mating (a). In case of habitat or host differentiation and mating on the host species, disruptive selection may directly lead to assortative mating (b), without the need for a preference locus ('automatic magic trait'). Figures after Servedio et al. (2011). Downloaded from Brill.com 12/12/2023 03:01:49PM via Open Access. This is an open access article distributed under the terms of the prevailing CC-BY license at the time of publication. http://creativecommons.org/licenses/by-nc/4.0