Figure 3

Proportion of individuals with the three possible genotypes in the risky area (in grey) and in the non-risky area (in black).

Heterozygotes 4R-2R in the risky area are almost at the maximum possible frequency (50%) for a randomly mating population. Sample sizes: 93 individuals with the genotype 4R-4R, 114 with 4R-2R, and 51 with 2R-2R.