Abstract
SUMMARYThe chromosomal analysis of various wild laboratory strains of Drosophila ananassae, a cosmopolitan domestic species, has shown that there is quantitative variation in the frequencies of different gene sequences occurring due to the cosmopolitan inversions. In some strains the chromosomes with inverted gene orders occur at frequencies higher than those of standard. The heterogeneity observed in the frequencies of a given gene arrangement among different strains seems to be due to the differences in allelic contents of the chromosomes. The results also reveal that there is an excess of inversion heterozygotes which in some strains reaches statistical significance. This indicates that the degree of heterosis may vary depending on the gene contents of the chromosomal variants. These results combined with those previously obtained clearly indicate that the pattern of chromosomal polymorphism in D. ananassae does not resemble that of other cosmopolitan species such as D. melanogaster, D. busckii and others.
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