Ecogeographic differentiation of metaphase karyotypes in natural populations of Drosophila kikkawai

SUMMARY

Heterochromatin is known to have contributed greatly in the karyotype variability of Drosophila kikkawai. Two types of IV chromosome, large acrocentric and medium metacentric, have been encountered in the Indian populations of this species. The frequency of different karyotypes with respect to the IV chromosome was analysed in four Indian populations. The results revealed that there exists a precise genotype-environment interactions.