Enzyme polymorphism in natural populations of Drosophila lutescens.

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Abstract
Enzyme polymorphisms in natural populations of a semidomestic species, Drosophila lutescens, were studied. Electrophoretic techniques were employed to investigate allelic variations at four enzyme loci (Est-α, Est-β, Acph and Mdh) in twenty-five natural populations and at other four enzyme loci (Me, Idh, G6pd and Adh) in three to five populations. The most frequent allele at a given locus was generally the most frequent allele in all populations, and the allelic frequencies at six dimorphic loci showed a remarkable similarity from population to population. A comparison of genetic distances (D by Nei) among twenty-one populations estimated on the basis of the allelic frequency for four enzyme loci surveyed showed little difference, giving an average distance of 0.0079. Glucose-metabolizing enzymes such as Mdh, Me, Idh and G6pd were less genetically variable than non-glucose-metabolizing enzymes (Est-α, Est-β, Acph and Adh).

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