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Genetic variation in correlations among size-related traits of head, thorax and wings was examined in Drosophila buzzatii, by comparing the correlation pattern of the phenotypic correlation matrix (CP-Rp) between inversion karyotypes of the second chromosome. CP-Rp differed between some karyotypes in a natural population. CP-Rp in homokaryotypic classes of wild-reared flies, but not in heterokaryotypes, differed from the whole population represented by laboratory-reared flies. Similarity in CP-Rp was highly significant for a same homokaryotype in two populations. In one of them, the chromosome is polymorphic for four inversions. In the other population, one of the inversions is almost fixed. CP-Rp was significantly similar between these populations, illustrating that similarity of CP-Rp may even occur between populations which have greatly diverged in frequencies of some genotypes affecting correlation patterns. It is suggested that chromosomal inversions are factors affecting genetic correlations among traits known to be phenotypically correlated with fitness components.

Correlations among size-related traits are affected by chromosome inversions in an adaptive polymorphism in Drosophila buzzatii