Fig. 1

Optimally discriminating concentrations of 4-methylimidazole in the DGRP2. The proportion of flies surviving following 24-hour exposure to 15 mM and 30 mM 4-methylimidazole was quantified for 14 maximally diverse DGRP2 lines. Exposure to 30 mM for 24 h showed the greatest variation in female survival proportion (A, B) while exposure to 15 mM for 24 h showed the greatest variation for male survival proportion (C, D). Error bars represent standard errors of the mean