Figure 2.

Map position for the 60 D. mauritiana introgressions within the D. simulans third chromosome tested in this study. Highlighted in grey are the minimum two loci introgressions causing a breakdown in second male paternity success and chromosome sections are divided by the two loci into five regions. Different shapes are used to box introgressions as spanning only regions 1 or 5 (rectangles), 2 and 3 or 3 and 4 (round edge rectangle), 2 and 3 or 3 and 4 (circle), at least four regions (round edge thick rectangle), and 2, 3 and 4 (thick rectangle). Average P2 values are given besides the line denoting the position of the introgression. Dashed lines are used for IG males with average P2 not significantly higher than D. mauritiana males. The thinner dashed line is used for one IG line that is not significantly different than D. mauritiana only when the reduced data set is used for analysis (see results). Asteriks identified two IG lines for which data is lost when the reduced data set is used. One P2 value significantly higher than D. mauritiana (underlined) containing the two candidate loci for CSP is suggestive of the possible existence of suppressor somewhere between 73A10 and 77B map position. Two other introgressions (within region 5) outside the mapped loci with average P2 nonsignificantly different than D. mauritiana are suggestive of other loci responsible for second male paternity breakdown. An inversion (relative to D. melanogaster map) is shown in the X-axis.