Salivary Gland Chromosome Relationship between Drosophila bifasciata and D. imaii

Abstract

The phylogenetic relationships between D. bifasciata and D. imaii have been established through inversion analysis of the hybrids. The analysis of salivary gland chromosomes has revealed that D. imaii differs from D. bifasciata by three inversion steps involving at least in two chromosomes (two in the second chromosome and one in the third chromosome). Furthermore, the comparisons of the intraspecific chromosomal polymorphisms has resulted in the finding that the Italian and Swiss strains of D. bifasciata occupy an intermediate position in the evolutionary history between D. imaii and the Japanese strains of D. bifasciata.