The natural Drosophila population is characterized by the presence of directional (DA) and fluctuating (FA) asymmetry of individuals. It was found that genotype has an effect on DA-level. FA evaluated in spring, summer and autumn periods had its maximum value in summer period. Genetically determined seasonal decrease in size of individuals was accompanied with increase in their FA. The structure of FA population variability is defined by genotypes of individuals. The phenotype and genotype structures of Drosophila population were investigated by FA of the individuals. There was regrouping of lineages number within of each frequency class in period from spring to autumn. Investigating central frequency class with least FA values in spring to summer period we observed the decrease in number of lineages for all traits with the exception of sternoupleral bristles (SB). At the same time the increase in number of lineages in the central and extreme frequency class with maximal FA values of sternoupleral bristles (SB). At the same time the increase in number of lineages in the central and extreme frequency class with maximal FA values of lines is observed. The number of lineages in the central frequency class of genotype structure is prevailing to all traits, without dependence on season. Individuals with rather high FA value acquire advantages in summer period whereas the individuals with low FA--in spring and autumn periods. Annual dynamics of FA is defined by this population parameters reorganization. The reasons of seasonal change of FA are discussed.
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