. Table 2 shows that only 2 of the 10 allozyme loci exhibit significant FsT values (Idh2 and Ppl). The mean FST value for the 10 protein loci is significant, but due entirely to the strong effect of the Ppl locus. In contrast, 10 of the 11 independent cDNA loci exhibit significant heterogeneity among popula- tions and the mean FST value for the RFLPs is highly significant. Although both sets of markers are character- ized by having one highly variable locus, the most diver- gent EWLP locus (GM798) exhibits allele frequencyvari- atioan m onpg o pulationtsh at exceeds the most divergent allozyme locus (PPI) by a factor of 10.