Figure 2.

Positions of the D. mauritiana chromosomal segments introgressed into the D. simulans background, on the third chromosome (modified from Tao et al., 2003). Each introgression is tagged by a P [w⁺] insert (open triangles on the top), followed by an individual number. The introgression ends are defined with the aid of ASO markers (names at the bottom and dotted lines). The ASO markers and P [w⁺] inserts are positioned according to polytene bands. Cytological positions are based on the standard map of D. melanogaster (Lefevre, 1976), but D. simulans differs from D. melanogaster by an inverted segment (93F6-7 to 84F9, the two arrows facing each other) (Horton, 1939). Filled oval: the centromere.