Figure 2 .

mPC1 lobe shape variation in b3852, Sam, F₁, and recombinant genotype classes. Each bar shows the mean (± SD) of multiple individuals, taking just a single lobe from each fly: b3852 (N = 29), Sam (N = 25), F₁ (N = 21), F₂ (N = 367), F₁₇ (N = 344), F₁₇ b3852 tail (N = 47), and F₁₇ Sam tail (N = 47). F₁ males derived from reciprocal parental crosses have similar shapes and were averaged. The groups of F₁₇ “tail” flies are the extreme individuals from either tail of the F₁₇ phenotypic distribution.