Fig. 4
Lower molar proportions for modern humans polymorphic for M 3 agenesis (n=66). Points are individual specimen molar proportions. Dashed line indicates DIC model’s predicted relationship between molar proportion ratios: M 3/M 1=2(M 2/M 1)−1. White regions are locations in molar proportion morphospace consistent with the DIC model: a high a/i region where M 1<M 2<M 3 and a low a/i region where M 1>M 2>M 3