Chromosome interactions in Drosophila robusta.

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 ...

Association of alleles of the malic dehydrogenase locus with a pericentric inversion in Drosophila robusta.

Associations of Malic dehydrogenase alleles with the third chromosome arrangement 3R and the pericentric arrangement 3L-R are described. Even though significant associations between alleles and inversions exist within a population, there is an overall similarity in MDH allele frequencies in different populations inspite of large differences in inversion frequencies.

Associations of alleles of the esterase-1 locus with gene arrangements of the left arm of the second chromosome in Drosophila robusta.

Evidence of strong associations of Est-1 alleles with the 2L, 2L1 and 2L3 gene arrangements of the left arm of the second chromosome in D. robusta is presented. Each gene arrangement is polymorphic for three to four Est-1 alleles. The allele frequencies differ in the 2L3 and 2L arrangements; the allele Est-1(.92) is 8% in the 2L3 arrangement (n=203)-this allele is 82% in the 2L arrangement (n=2...

Food preference in Drosophila robusta and Drosophila tripunctata following desiccation

Patterns of gene variation in central and marginal populations of Drosophila robusta.

The central and marginal populations of D. robusta differ greatly in the level of inversion polymorphism; the marginal populations are monomorphic or nearly so and the central populations are highly polymorphic. This paper presents the frequencies of alleles at forty gene loci in various populations of D. robusta, studied by electrophoresis of proteins and enzymes. Population samples were obtai...