Abstract
Experiments were conducted to estimate the migratory behavior of D. melanogaster under the genetically heterogeneous conditions. Five wild, five vestigial and four kinds of F1 hybrid strains between wild strains were used.
The migratory activity of the vestigial strains was promoted by the wild ones except in a few cases, while the wild type strains were reduced in activity when mixed with vestigial strains. Furthermore, the migratory activity of either wild type or vestigial strains increased when mixed with strains of different genetic background.
From the results of cross-experiment, it was found that the larger the difference between genetic background of the two strains in a mixture, the more intense the stimulation effect on migratory activity appears.
