Mating Behavior and Sexual Isolation in the Drosophila Virilis Species Group

Behaviour ◽  
1951 ◽  
Vol 3 (1) ◽  
pp. 105-144 ◽  
Author(s):  
Herman T. Spieth
Keyword(s):  
Mating Behavior ◽  
Sexual Isolation ◽  
Species Group ◽  
Drosophila Virilis

Discordant Rates of Chromosome Evolution in the Drosophila virilis Species Group

Genetics ◽  
1997 ◽  
Vol 147 (1) ◽  
pp. 223-230 ◽  
Author(s):  
Jorge Vieira ◽  
Cristina P Vieira ◽  
Daniel L Hartl ◽  
Elena R Lozovskaya
Keyword(s):  
Polytene Chromosome ◽  
Genomic Dna ◽  
Chromosome Evolution ◽  
Species Group ◽  
Drosophila Virilis ◽  
Chromosome 1 ◽  
Chromosome 3 ◽  
Bacteriophage P1 ◽  
Minimum Number ◽  
Chromosome Maps

Abstract In Drosophila, the availability of polytene chromosome maps and of sets of probes covering most regions of the chromosomes allows a direct comparison of the organization of the genome in different species. In this work, we report the localization, in Drosophila virilis, D. montana, and D. novamexicana, of >100 bacteriophage P1 clones containing ~65 kilobase inserts of genomic DNA from D. virilis. Each clone hybridizes with a single euchromatic site in either chromosome 1 or chromosome 3 in D. virilis. From these data, it is possible to estimate the minimum number of inversions required to transform the map positions of the probes in one species into the map positions of the same probes in a related species. The data indicate that, in the D. virilis species group, the X chromosome has up to four times the number of inversions as are observed in chromosome 3. The first photographic polytene chromosome maps for D. montana and D. novamexicana are also presented.

scholarly journals The genetic basis of a species-specific character in the Drosophila virilis species group.

Genetics ◽  
1991 ◽  
Vol 128 (2) ◽  
pp. 331-337 ◽  
Author(s):  
G S Spicer
Keyword(s):  
Genetic Basis ◽  
Sex Chromosome ◽  
Species Group ◽  
Drosophila Virilis ◽  
Interspecific Crosses ◽  
Chromosome 2 ◽  
Specific Character ◽  
Number Of Factors ◽  
Species Specific ◽  
Dorsal Stripe

Abstract 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 significant effect on the width of the dorsal stripe. All the autosomes act approximately additively; only minor interactions were detected among them. No significant maternal effects were found. This means that a minimum of five loci are involved in the character difference between the two species, and this is the maximum number that this technique could discern. These results suggest that, based on the number of factors involved in the character difference, the inheritance of this character should be considered polygenic, but because chromosome 2 (the largest chromosome in the species) contributed over half of the variance toward the character difference, it is best to consider the inheritance oligogenic based on effect. The implications of these findings are discussed in light of the importance of macromutation in speciation and the sex chromosome theory of speciation.

scholarly journals The Drosophila ananassae species complex: Evolutionary relationships among different members

Genetika ◽  
2013 ◽  
Vol 45 (1) ◽  
pp. 273-288 ◽  
Author(s):  
B.N. Singh ◽  
Seema Sisodia
Keyword(s):  
Indian Subcontinent ◽  
Natural Populations ◽  
Evolutionary Genetics ◽  
Sexual Isolation ◽  
Species Group ◽  
Drosophila Ananassae ◽  
Isolated Populations ◽  
Widespread Species ◽  
Island Species ◽  
Species Complexes

Information about genetic structure and historical demography of natural populations is central to understanding how natural selection changes genomes. Drosophila ananassae is a widespread species occurring in geographically isolated or partially isolated populations and provides a unique opportunity to investigate population structure and molecular variation. D. ananassae and its closely related species serve as a widely used model in population and evolutionary genetics. The ananassae subgroup belongs to the melanogaster species group. This subgroup contains 22 described species distributed mainly throughout Southeast Asia, with some species expanding into northeastern Australia, South Pacific and Indian subcontinent and Africa. Within the ananassae subgroup, three species complexes-ananassae, bipectinata and ercepeae have been recognized based on male genital morphology. D. ananassae and its relatives have many advantages as a model of genetic differentiation and speciation. In this review, distribution, phylogenies, hybridization, sexual isolation among D. ananassae complex have been discussed. The complex of several cryptic island species provides a useful model for evolutionary studies dealing with the mechanisms of speciation.

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