VIDENCE is accumulating to support the observation that the fitness of a E particular genotype in a given environment may be improved or impaired by the presence in that same environment of conspecific carriers of other genotypes. This has been shown in Drosophila pseudoobscura by LEVENE, PAVLOVSKY and DOBZ,HANSKY (1954), and BEARDMORE (1963) ; in D. melanogaster by LEW-
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David Weisbrot (1966) studied this question.
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