variation at a candidate neurogenic locus, scabrous, was examined in Drosophila
melanogaster. Approximately 32 percent of the genetic variation in abdominal bristle
number (21 percent for sternopleural bristle number) among 47 second chromosomes from
a natural population was correlated with DNA sequence polymorphisms at this locus.
Several polymorphic sites associated with large phenotypic effects occurred at intermediate …