Abstract
Several recent studies using natural populations of Drosophila show that one must be very careful when sorting among the large number of molecular polymorphisms found at most loci to identify the nucleotide changes responsible for phenotypic variation in complex traits. Indeed, several mutations within a single allele can interact to generate the overall observed effect. The results are instructive both for those interested in the genetics of evolutionary change and for those attempting to ferret out the genetic basis of complex human diseases.
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