Figure 1.

QTL affecting variation in pigmentation between D. yakuba and D. santomea. (A) F₁ females [from D. yakuba (males) × D. santomea (females)] backcrossed to D. yakuba males. (B) F₁ females [from D. yakuba (females) × D. santomea (males)] backcrossed to D. santomea males. Molecular makers are indicated as triangles on the x-axis. Plots are likelihood-ratio (LR) test statistics for pigmentation differences between males (teal) and females (magenta) as determined by composite interval mapping. Significance thresholds for each cross were determined by permutation and are ∼LR = 10 for each cross, denoted by the dashed horizontal line.