POLYTENE CHROMOSOME ARRANGEMENTS IN DROSOPHILA-BOCKI

Cytological investigations of salivary gland polytene chromosomes of t he Drosophila kikkawai complex in Thailand have revealed an interestin g pattern of species divergence. Drosophila bocki, D. leontia and D. k ikkawai share chromosome arrangement 3LB. However, additional gene arr angements of 3LA and 3LC have been observed in D. kikkawai and D. leon tia, respectively, while D. bocki remains polymorphic for inversion 3L B. Chromosomal evidence seems to suggest that D. bocki is similar to a common ancestor of the D. kikkawai complex.