| alcohol dehydrogenase polymorphism in barrel cactus populations of drosophila mojavensis. | starch gel electrophoresis revealed that the alcohol dehydrogenase (adh-2) locus was polymorphic in two populations (from agua caliente, california and the grand canyon, arizona) of cactophilic drosophila mojavensis that utilize barrel cactus (ferocactus acanthodes) as a host plant. electromorphs representing products of a slow (s) and a fast (f) allele were found in adult flies. the frequency of the slow allele was 0.448 in flies from agua caliente and 0.659 in flies from the grand canyon. thes ... | 1996 | 8765684 |
| activity variation in alcohol dehydrogenase paralogs is associated with adaptation to cactus host use in cactophilic drosophila. | drosophila mojavensis and drosophila arizonae are species of cactophilic flies that share a recent duplication of the alcohol dehydrogenase (adh) locus. one paralog (adh-2) is expressed in adult tissues and the other (adh-1) in larvae and ovaries. enzyme activity measurements of the adh-2 amino acid polymorphism in d. mojavensis suggest that the fast allozyme allele has a higher activity on 2-propanol than 1-propanol. the fast allele was found at highest frequency in populations that utilize hos ... | 2005 | 15910339 |
| microsatellite variation among diverging populations of drosophila mojavensis. | divergence and speciation may occur by various means, depending on the particular history, selective environments, and genetic composition of populations. in drosophila mojavensis, a good model of incipient speciation, understanding the population genetic structure within this group facilitates our ability to understand the context in which reproductive isolation among populations is developing. here we report the genetic structure and relationships of d. mojavensis populations at nuclear loci. ... | 2006 | 16910998 |
| sympatry, allopatry and sexual isolation between drosophila mojavensis and d. arizonae. | populations of the north american cactophilic fruitfly drosophila mojavensis and its sibling species d. arizonae exist both in sympatry and in allopatry. females of d. arizonae, regardless of their population of origin, are effectively completely isolated behaviorally from d. mojavensis males. on the other hand, females of d. mojavensis from the sympatric populations in sonora, mexico exhibit significantly stronger premating isolation from d. arizonae males than do d. mojavensis females from all ... | 2005 | 16970612 |
| evolutionary relationships of drosophila mojavensis geographic host races and their sister species drosophila arizonae. | the cactophilic drosophila mojavensis species group living in the deserts and dry tropical forests of the southwestern united states and mexico provides a valuable system for studies in diversification and speciation. rigorous studies of the relationships between host races of d. mojavensis and the relationships among the members of the species group (d. mojavensis, drosophila arizona, and drosophila navojoa) are lacking. we used mitochondrial co1 sequence data to address the phylogenetics and p ... | 2007 | 17305857 |