INTERACTION OF THE ADAPTIVE VALUES IN POLYMORPHIC EXPERIMENTAL POPULATIONS OF<i>DROSOPHILA PSEUDOOBSCURA</i>

Abstract

field has disclosed that the fitness of the different karyotypes is extremely sensitive to environmental conditions. Furthermore, the karyotypes which occur in a ~iven natural population are mutually adjusted by natural selection to confer a high average fitness on the Mendelian population as a whole (Dobzhansky and Levene, 1951; Dobzhansky and Pavlovsky, 1953).