Figure 7. The estimated trait values of F2 hybrid pupfish (Snail-eater X Scale-eater ) compared to F0 parental species from Crescent Pond and Little Lake. Grey dots forming a histogram beneath each trait show the distribution of F2 phenotypes; The colored density graph above each histograms depict the posterior draws from a Bayesian model with the 18 craniofacial trait values as the response variable and population as the fixed effect. Blue circles represent the F0 snail-eater parental phenotype for each trait, while orange triangles represent the F0 scale-eater parental phenotype for each trait. Finally, grey diamonds depict the mid-parent trait value which represents the expected phenotype trait value under the assumptions of additivity.