The interdependence between manifestations of character on different sides of the body in case of mutations with incomplete penetrance affecting phenotypically symmetrical parts of the body was analysed in several stocks of Drosophila melanogaster. According to Astaurov's conception, if manifestations of character on different sides of the body of an individual are independent events, the heterogeneity of genetic background and environment causes a positive dependency in the mutant stock. About 130 anomalous characters of 15 alleles of 6 genes were examined. It was found that the dependence in the stocks is practically always positive. In view of the heterogeneity of environment and genotypes in the natural populations, the dependence among predisposed genotypes of a population is obviously positive. Except for one case, we could not obtain negative dependency between the sides by selection for 14-16 generations in several mutant stocks. The possibility to use mutations with incomplete penetrance affecting antimeres for evaluation of heterogeneity of the environment and the genetic background in the cultivated stocks is shown. A quantitative criterion of the heterogeneity is given.
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