DROSOPHZLA PAVANI BRNCIC 1957 is a neotropical species belonging to the mesophragmatica group which is very abundant in central Chile and on the eastern slope 01 the Andes in Argentine. The natural populations of this species are polymorphic for the gene arrangements in two of its chromosomes. Chromosome 2 has two inversions, one included within the other, which have up to now never been found ...

Nucleotide variation at the ribosomal protein 49 (rp49) gene region has been studied in 75 lines of Drosophila subobscura belonging to four chromosomal arrangements (Ost, O3+4, O3+4+8, and O3+4+23). The location of the rp49 gene region within the inversion loop differs among heterokaryotypes: it is very close to one of the breakpoints in heterozygotes involving Ost chromosomes, while it is in a...

EXPERIMENTS testing the evolution of fitness of genetic material can be performed by evaluating changes in the competitive abilities of laboratory genotypes that have occurred over relatively short periods of time. In Drosophila such experiments have been performed by utilizing tests for success in interspecific competition (MOORE 1952; STRICKBERGER 1963a) or by utilizing competitive tests betw...

The role of chromosomal inversions in adaptation and speciation is controversial. Historically, inversions were thought to contribute to these processes either by directly causing hybrid sterility or by facilitating the maintenance of co-adapted gene complexes. Because inversions suppress recombination when heterozygous, a recently proposed local adaptation mechanism predicts that they will spr...

To generate a model of mammalian karyotype evolution and to extend our knowledge of the evolutionary relationships of mammals, it is helpful to deduce ancestral chromosomal arrangements. Of particular interest would be a global comparison among the 3 major extant groups of mammals, since this would reveal the most ancient arrangements of the mammalian genome and allow us to follow chromosomal r...

T least three principal facts concerning the adaptive functions of chromosomal A variants (inversions) in Drosophila populations have been established notably by DOBZHANSKY (1947, 1955), DOBZHANSKY and WALLACE (1953), DOBZHANSKY and LEVENE (1951), DOBZHANSKY and PAVLOVSKY (1953), and WALLACE (1953) : 1) Natural selection may build up particular genic complexes in a chromosomal variant adapting ...

Understanding phylogenetic relationships within species complexes of disease vectors is crucial for identifying genomic changes associated with the evolution of epidemiologically important traits. However, the high degree of genetic similarity among sibling species confounds the ability to determine phylogenetic relationships using molecular markers. The goal of this study was to infer the ance...