Abstract
Twelve natural populations of Drosophila ananassae from India were analysed for chromosome inversions. The chromosomal analysis revealed the presence of all three previously described cosmopolitan inversions in the populations studied. The frequency of inversions and the level of inversion heterozygosity vary significantly among populations. The x2 values calculated to measure the difference in karyotype frequencies between populations demonstrate highly significant variation in most of the cases. To quantify the amount of genetic differentiation at the level of chromosomal polymorphism in these populations, the average genetic identity (I) has been calculated on the basis of frequencies of different gene sequences. The values of I suggest that Indian populations of D. ananassae have undergone considerable amount of genetic divergence at the level of chromosomal polymorphism.
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