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Figure 6


Fig. 6. Evolutionary steps leading to the adaptive evolution of the blue opsin duplication and the evolution of sexually dimorphic eyes. Step (1). Duplication of the blue opsin gene. Step (2) Neofunctionalization of the B2 opsin (BRh2) to an extremely red-shifted (500 nm) peak absorbance. Step (3) Subfunctionalization of the BRh2 expression to a subset of the R1 and R2 photoreceptor cells that are non-overlapping with BRh1 and UVRh. Step (4) Alteration in the regulation of BRh1 (B1) spatial expression to include co-expression with LWRh (LW) the outer R3-8 photoreceptor cells of dorsal eye of both sexes. Step (5) Suppression of LWRh opsin expression in dorsal eye of males only. Color code: black, UV opsin; dark blue, B1 opsin; light blue, B2 opsin; orange, LW opsin.