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Free keywords:
change in selection, clinal variation, dispersal, ecotonal, natural selection, steppe, tundra
population-structure; gene flow; thermoregulatory strategies; drosophila-melanogaster; evolution; genotypes; differentiation; biochemistry; maintenance; constraints
Abstract:
Natural genetic variants at the phosphoglucose isomerase, PGI, gene differ in spatial patterning of their polymorphism among species complexes of Colias butterflies in North America. In both lowland and alpine complexes, molecular-functional properties