EXPERIMENTS ON CHROMOSOMAL VARIABILITY IN DROSOPHILA ROBUSTA

Chromosome interactions in Drosophila robusta.

M O S T of the population genetics work on Drosophila species has been done with polymorphism at a single gene locus or different gene arrangements in one chromosome which behave in inheritance as single genetic units. However, little attention has been given to the problem of interactions between unlinked polymorphic loci. Consider two unlinked autosomal loci A and B and their variant alleles ...

Studies of Linkage in Populations. IX. the Effect of Altitude on X-Chromosomal Arrangement Combinations in DROSOPHILA ROBUSTA.

Data are presented concerning the gene arrangements in both arms of the X-chromosome of Drosophila robusta in eight altitudinal transects. The major change appears to be the increase of gene arrangement XL-1 (and decrease in XL, sometimes also XL-2) with increasing altitude. In each transect only one combination of XL-1 with a right arm arrangement seems primarily responsible for the increases ...

Food preference in Drosophila robusta and Drosophila tripunctata following desiccation

Effect of inversion polymorphism on the neutral nucleotide variability of linked chromosomal regions in Drosophila.

Recombination is a main factor determining nucleotide variability in different regions of the genome. Chromosomal inversions, which are ubiquitous in the genus Drosophila, are known to reduce and redistribute recombination, and thus their specific effect on nucleotide variation may be of major importance as an explanatory factor for levels of DNA variation. Here, we use the coalescent approach ...

Sexual Selection Operating in a Wild Population of Drosophila Robusta.

Almost 60 years have elapsed since the discovery of variation in the polytene chromosomes of Drosophila (Sturtevant and Dobzhansky 1936). Inversion polymorphism studies have revealed some of the intricacies of evolutionary change, but even now, when interest in them has waned, there is little understanding of the particular alleles contained within them that alone or in relation to other genes ...