| biochemical characterization of the products of the adh loci of drosophila mojavensis. | the electrophoretic pattern of alcohol dehydrogenase (adh) of drosophila mojavensis is composed of multiple bands. in previous studies from this laboratory we suggested on the basis of genetic evidence that multiple adh bands were due to the presence of a gene duplication. in the studies presented here, this hypothesis is supported by data derived from comparing the protein biochemistry of each adh. three forms of d. mojavensis adh have been isolated. these are the adh-1 homodimer, the adh-2 hom ... | 1983 | 6362655 |
| differential regulation of duplicate alcohol dehydrogenase genes in drosophila mojavensis. | these studies report the existence of multiple forms of alcohol dehydrogenase in extracts of drosophila mojavensis. the existence of these forms can be best explained by the hypothesis of a duplication for the adh locus in d. mojavensis. electrophoretic variants at each locus have been identified and crosses between individuals carrying alternative alleles at each locus result in f1 progeny with six bands of adh. this pattern is consistent with these individuals being heterozygous at two loci. t ... | 1983 | 6339297 |
| an esterase duplication in drosophila: differences in expression of duplicate loci within and among related species. | an esterase duplication is described in the sibling species pair drosophila mojavensis and drosophila arizonensis. we present evidence for two separate structural loci mapping at a distance of less than 0.16 recombination units from each other. alleles at the two loci have the same substrate specificities and form small amounts of interlocus heterodimers. one locus (est-5) is functioning throughout the insect's life cycle and appears at high concentrations in the hemolymph and the fat body. its ... | 1982 | 7181852 |
| substrate-preference polymorphism at an esterase locus of drosophila mojavensis. | in a larval esterase of drosophila mojavensis there are alleles whose products preferentially hydrolyze alpha-naphthyl esters, whereas the majority of the alleles hydrolyze preferentially beta-naphthyl esters. in a collection of laboratory stocks alpha alleles have a frequency of 15%. three different mobilities of alpha alleles were discovered, suggesting a polymorphism rather than a single mutation event. if substrate-preference polymorphisms are common among "multiple-substrate" enzymes (categ ... | 1982 | 7106559 |
| courtship behavior and control of reproductive isolation between drosophila mojavensis and drosophila arizonensis. | | 1981 | 28581052 |
| the chromosomal basis of sexual isolation in two sibling species of drosophila: d. arizonensis and d. mojavensis. | the chromosomal determination of interspecific differences in mating behavior was studied in the interfertile pair, drosophila arizonensis and drosophila mojavensis, by means of chromosomal substitutions. interspecific crossing over was avoided by crossing hybrid males to parental females, and identification of the origin of each chromosome in backcrossed hybrids was possibly by means of allozyme markers. it was found that male mating behavior is controlled by factors located in the pgm-marked c ... | 2013 | 7297853 |
| sexual isolation among populations of drosophila mojavensis: response to pressure from a related species. | | 1980 | 28568688 |
| structural flexibility of isozyme variants: genetic variants in drosophila disguised by cofactor and subunit binding. | wild populations of drosophila mojavensis exhibit considerable conformational variation in the nad+-free form of alcohol dehydrogenase (alcohol:nad+ oxidoreductase; ec 1.1.1.1). the variation appears genetic, as it does not occur within an inbred strain. the nad+-bound form of alcohol dehydrogenase, present in the same individuals, does not exhibit the variation, suggesting that the binding of nad+ acts to stabilize conformation. such cofactor binding to enzymes may thus conceal considerable var ... | 1978 | 203939 |
| character displacement for sexual isolation between drosophila mojavensis and drosophila arizonensis. | | 1977 | 28563708 |
| patterns of molecular variation. ii. associations of electrophoretic mobility and larval substrate within species of the drosophila mulleri complex. | electromorphic variation among populations of drosophila mojavensis, d. arizonensis and d. longicornis was examined for seven genetic loci. the average electrophoretic mobility for a population was used as the metric. d. mojavensis and d. arizonensis use larval substrates in different parts of their geographic ranges, while d. longicornis is more narrowly restricted to different species of the cactus opuntia in different localities. there is marked electromorphic variation among populations of e ... | 1977 | 838268 |
| extension of longevity in drosophila mojavensis by environmental ethanol: differences between subraces. | drosophila mojavensis adults, which breed and feed on necrotic cacti, show an increase in longevity when exposed to atmospheric ethanol. the increase in longevity is accompanied by retention of mature ovarioles and is independent of diet. differences in longevity among strains from different localities were detected for females. strains from arizona and sonora, mexico, showed the greatest increase in longevity, while strains from baja california, mexico, showed the least increase. these differen ... | 1977 | 13369 |
| relative fitness of introgressed and parental populations of drosophila mojavensis and d. arizonensis. | | 1969 | 28562879 |