Can Physiologic Traits be Used to Identify Genotypic Characteristics?
Since specific genes or gene complexes are related to particular phenotypic characteristics, it is interesting to speculate whether the reverse pathway might be followed, namely, identifying subsets of organisms with similar phenotypic attributes that can then be shown to have similar (or the same) genetic characteristics. This concept is embodied in the so called “physiotype approach” described elsewhere (24). Among the phenotypic traits that organisms possess, biochemical/physiologic traits are of most relevance to survival in polluted conditions [hence the term “physiotypes” (24)]. For a given genotype, a range of phenotypic outcomes are possible depending on environmental history and prevailing conditions. This range was referred to as the “norm of reaction” by Dobzhansky (25). In a given population, the “norms of reaction” of all genotypes overlap (26), but if a selection pressure is applied, then only subsets of genotypes that confer suitable phenotypic characteristics will persi
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