Figure 2.

Genealogy for alleles at the b1 mating compatibility gene. The topology was obtained by a Neighbor-Joining algorithm with bootstrap values shown for 1,000 replicates, and branch lengths are proportion of synonymous substitutions per codon (see Methods and Materials). Locations are Britain (BR), France (FR), Japan (JP), Java (JV), Minnesota population 1 (MN1), Minnesota population 2 (MN2), North Carolina (NC), and Scotland (SC). The d1-1 allele (see Fig. 1) was used as an outgroup. ∗, Branch lengths not significantly greater than 0.0 in Generalized Least Squares.