Protein Polymorphism, Genic Heterozygosity and Divergence in the Toads Bufo cognatus and B. speciosus

Genetic variation was studied in two species of toads, Bufo cognatus and B. speciosus by electrophoresis of six proteins, controlled by 10 loci. Five of the loci examined were essentially monomorphic, both species sharing the same fixed allele at each locus. The other five loci were polymorphic. The primary differences between B. cognatus and B. speciosus at these five loci were in frequencies of shared alleles, with a few rare alleles that are unique to each species. The average percentages of the 10 loci that were polymorphic in each sample were 42% and 52% in B. speciosus and B. cognatus, respectively. The corresponding average percentages of heterozygous loci per individual were 10.7% and 12.1%. These estimates fall well within the range of values established for a variety of other animal species, including man.

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