Individual Genetic Contributions to Genital Shape Variation between Drosophila simulans and D. mauritiana

Figure 4

Genomic regions that significantly affect species-specific lobe size and shape. The third chromosome is shown at the top of the figure: the black circle is the centromere, and the brackets represent a fixed inversion difference between D. melanogaster compared to D. simulans, D. mauritiana, and D. sechellia. Numbers above the chromosome are approximate cytological regions. (a) Introgressions of D. mauritiana into an otherwise D. simulans genetic background (S_M) and (b) introgressions of D. simulans into an otherwise D. mauritiana genetic background (M_S) that significantly affected the area (filled red bars; data from Table 2, Figure 2) or shape (filled blue bars; data from Figure 3) of the posterior lobe; open bars indicate nonsignificance for these traits. The length of the bars approximates the size of the introgressed segment. (c) Introgressions of D. mauritiana into an otherwise D. sechellia genetic background (adapted from [22]) that significantly affected the area (red circles) or shape (blue circles) of the posterior lobe. The circles represent the midpoint of the introgression; there is a fade-out on the periphery to indicate that the boundaries of these introgressions are not published. All of the introgressions in (a), (b), and (c) are aligned with their representative cytological positions on the chromosome.