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Expressed and potential quantitative variation in experimental populations of Drosophila melanogaster.

The impact of past history on experimental populations of Drosophila has been investigated in populations started from a number of selection lines originally obtained from the same base population. The characters studied are sternopleural and abdominal bristle number. Hidden genetic variability has been estimated from realized heritability in selection experiments performed at different stages, the last at about 360 generations from the start. The populations all exhibited a genetic potential to return to the level of the base population but in spite of this remained at distinct phenotypic levels. Various aspects of the genetic architecture of the populations have been investigated.