| inferring the evolutionary history of drosophila americana and drosophila novamexicana using a multilocus approach and the influence of chromosomal rearrangements in single gene analyses. | the evolutionary history of closely related organisms can prove sometimes difficult to infer. hybridization and incomplete lineage sorting are the main concerns; however, genome rearrangements can also influence the outcome of analyses based on nuclear sequences. in the present study, dna sequences from 12 nuclear genes, for which the approximate chromosomal locations are known, have been used to estimate the evolutionary history of two forms of drosophila americana (drosophila americana america ... | 2008 | 18482259 |
| drosophila pigmentation evolution: divergent genotypes underlying convergent phenotypes. | similar phenotypic changes have evolved independently in many animal taxa. it is unknown whether independent changes involve the same or different developmental and genetic mechanisms. myriad pigment patterns in the genus drosophila offer numerous opportunities to address this question. previous studies identified regulatory and structural genes involved in the development and diversification of pigmentation in selected species. here, we examine drosophila americana and drosophila novamexicana, ... | 2003 | 12574518 |
| genetic basis of reduced eyes in the hybrids of drosophila virilis phylad species. | structural anomalies were detected in f1 and backcross hybrids of drosophila virilis and three of its sibling species drosophila novamexicana, drosophila americana texana and drosophila americana americana. similar but not identical anomalies have been described in d. virilis x d. lummei hybrids. f1 (d. virilis x d. novamexicana) hybrids had only slight disorders in the abdominal cuticula, but 5.3% of the first backcross generation hybrids had reduced eyes. eye defects in the second generation w ... | 1992 | 1295856 |
| an x chromosome effect responsible for asymmetric reproductive isolation between male drosophila virilis and heterospecific females. | reproductive isolation between closely related species is expressed through uncoordinated courtship, failed fertilization, and (or) postzygotic barriers. behavioural components of mating often form an initial barrier to hybridization between species. in many animals, females are responsible for mating discrimination in both intra- and interspecific crosses; males of drosophila virilis group represent an exception to this trend. using overall productivity tests, we show that a lower proportion of ... | 2009 | 19132071 |
| an old bilbo-like non-ltr retroelement insertion provides insight into the relationship of species of the virilis group. | in drosophila, at the population and species level, fixation of a te insertion is an unlikely fate. of the few reported fixations at the species level most involve non-ltr retroelements. in this work we report the fixation of a non-ltr retroelement in five species (drosophila littoralis, drosophila virilis, drosophila lummei, drosophila americana and drosophila novamexicana) of the virilis group of drosophila. in most species, this te insertion is being lost through the accumulation of small del ... | 2008 | 18775768 |
| the genetic basis of a species-specific character in the drosophila virilis species group. | the genetic basis of the species-specific dorsal abdominal stripe of drosophila novamexicana was examined. the dorsal stripe is present in d. novamexicana and absent in all other members of the drosophila virilis species group. interspecific crosses between d. novamexicana and genetically marked d. virilis revealed that all four of the autosomes (except the tiny dot chromosome, which was not marked) and the sex chromosomes (the x and y chromosome effects could not be disentangled) showed a signi ... | 1991 | 2071018 |