| chromosomal polymorphism in indian populations of drosophila bipectinata duda. | drosophila bipectinata, a member of the melanogaster species group, is a common and wide-spread species in the indian subcontinent. a geographic survey of inversion polymorphism has been carried out in indian populations. altogether, nine paracentric inversions are detected in the populations examined during this study. of the nine inversions, two have been described earlier by bock from laboratory populations established from borneo, thailand and the philippines. the possible relationship betwe ... | 1990 | 2126775 |
| a primary role of developmental instability in sexual selection. | in evolutionary biology, fluctuating asymmetry (fa) is thought to reveal developmental instability (di, inability to buffer development against perturbations), but its adaptive and genetic bases are being debated. in other fields, such as human clinical genetics, di is being assessed as incidence of minor morphological abnormalities (mmas) and used to predict certain fitness outcomes. here, for the first time, we combine these complementary measures of di in sexual selection and quantitative gen ... | 2007 | 17939982 |
| on crossing between drosophila bipectinata and drosophila malerkotliana. | | 2015 | 4764762 |
| patterns of amino acid evolution in the drosophila ananassae chimeric gene, siren, parallel those of other adh-derived chimeras. | siren1 and siren2 are novel alcohol dehydrogenase (adh)-derived chimeric genes in the drosophila bipectinata complex. d. ananassae, however, harbors a single homolog of these genes. like other adh-derived chimeric genes, siren evolved adaptively shortly after it was formed. these changes likely shifted the catalytic activity of siren. | 2008 | 18780749 |
| twin intromittent organs of drosophila for traumatic insemination. | in several animals, male genitalia create insemination wounds in areas outside the genital orifice of females. i report that such traumatic insemination (ti) occurs in the drosophila bipectinata complex (diptera: drosophilidae) and illustrate a previously unknown evolutionary pathway for this behaviour. flash fixation of mating pairs revealed the dual function of the paired claw-like basal processes, previously misidentified as a bifid aedeagus: (i) penetration of the female body wall near the g ... | 2007 | 17519186 |
| proceedings of the smbe tri-national young investigators' workshop 2005. unusual evolution of interspersed repeat sequences in the drosophila ananassae subgroup. | new repeat sequences were found in the drosophila ananassae genome sequence. they accounted for approximately 1.2% of the d. ananassae genome and were estimated to be more abundant in genomes of its closely related species belonging to the drosophila bipectinata complex, whereas it was entirely absent in the drosophila melanogaster genome. they were interspersed throughout euchromatic regions of the genome, usually as short tandem arrays of unit sequences, which were mostly 175-200 bp long with ... | 2006 | 16467489 |
| the drosophila bipectinata species complex: phylogenetic relationship among different members based on chromosomal variations. | making interspecific hybridizations, where possible remains an unparalleled option for studying the intricacies of speciation. in the drosophila bipectinata species complex comprising of four species, namely d. bipectinata, d. parabipectinata, d. malerkotliana and d. pseudoananassae, interspecific hybrids can be obtained in the laboratory, thus bequeathing an ideal opportunity for studying speciation and phylogeny. with the view of investigating the degree of divergence between each species pair ... | 2017 | 28360394 |
| co-evolving cenp-a and cal1 domains mediate centromeric cenp-a deposition across drosophila species. | centromeres mediate the conserved process of chromosome segregation, yet centromeric dna and the centromeric histone, cenp-a, are rapidly evolving. the rapid evolution of drosophila cenp-a loop 1 (l1) is thought to modulate the dna-binding preferences of cenp-a to counteract centromere drive, the preferential transmission of chromosomes with expanded centromeric satellites. consistent with this model, cenp-a from drosophila bipectinata (bip) cannot localize to drosophila melanogaster (mel) centr ... | 2016 | 27093083 |
| the drosophila bipectinata species complex: degree of sterility and dystrophied ovaries in interspecific hybrid females. | | 2016 | 27019445 |
| sex-specific asymmetry in eye development in interspecific hybrids in the drosophila bipectinata species complex. | | 2015 | 26440090 |
| interspecific hybridization does not affect the level of fluctuating asymmetry (fa) in the drosophila bipectinata species complex. | the drosophila bipectinata species complex comprises of four very closely related species namely d. bipectinata, d. parabipectinata, d. malerkotliana and d. pseudoananassae. it was found that irrespective of the evolutionary divergence among the species, fa which is reflective of the developmental precision remains nearly same in four species. during the present study, the level of fa in different morphological traits was studied in interspecific hybrids and compared with that of parental specie ... | 2015 | 25987248 |
| genetic analyses of resistance against leptopilina victoriae in drosophila bipectinata. | drosophila bipectinata from iriomote-jima (ir) is susceptible to the endoparasitoid leptopilina victoriae from kota kinabalu (l. victoriae kk), but d. bipectinata from kota kinabalu (kk) and bogor (bg) is resistant. the cross experiments between the resistant (kk) and susceptible (ir) populations of d. bipectinata suggested that the resistance to this parasitoid is a dominant trait and controlled by a single locus or few linked loci on an autosome. in the aflp analysis using the ir, kk and bg po ... | 2015 | 25663497 |
| sperm displacement in the drosophila bipectinata species complex: evidence for interspecific variations. | we studied sperm displacement in two members of the drosophila bipectinata species complex i.e., drosophila parabipectinata and drosophila malerkotliana by employing mutant and wild type strains. we found a significant increase in the productivity of remated females than that of once mated ones in all the crosses of the two species. the p2' values range from 0.67 to 0.70 in d. malerkotliana and 0.52 to 0.56 in d. parabipectinata. these results were compared with that of our earlier finding in d. ... | 2015 | 25556898 |
| pattern of mating preference of interspecific hybrid females and phylogeny in the drosophila bipectinata species complex. | | 2014 | 25189246 |
| relationship between male age, accessory gland, sperm transferred, and fitness traits in drosophila bipectinata. | the number of cells and the size of the cells in the male accessory gland, the quantity of accessory gland proteins, and their effects on fitness in males of different ages were studied in drosophila bipectinata duda (diptera: drosophilidae). male age was significantly positively correlated with the size of accessory gland, the number of main cells of the accessory gland, the quantity of protein in unmated males, the duration of copulation, the transferred quantity of protein and sperm to the ma ... | 2013 | 24785586 |
| mating latency, duration of copulation and fertility in four species of the drosophila bipectinata complex. | significant interspecific variations in mean duration of copulation and fertility were observed in four species of the drosophila bipectinata species complex. however, d. bipectinata showed positive correlation between duration of copulation and fertility. similarly, d. malerkotliana showed negative correlation between mating latency and duration of copulation. likewise, d. pseudoananassae showed positive correlation between mating latency and fertility. these results suggest that d. pseudoanana ... | 2014 | 24597151 |
| divergent strategies for adaptations to stress resistance in two tropical drosophila species: effects of developmental acclimation in d. bipectinata and the invasive species d. malerkotliana. | previous studies on two tropical drosophila species (d. malerkotliana and d. bipectinata) have shown lower resistance to stress-related traits but the rapid colonization of d. malerkotliana in the past few decades is not consistent with its sensitivity to desiccation and cold stress. we tested the hypothesis that developmental acclimation at two growth temperatures (17 and 25°c) can confer adaptations to desiccation and thermal stresses. we found divergence in developmental plastic effects on cu ... | 2014 | 24265421 |
| studies on remating behaviour in the drosophila bipectinata species complex: intra- and interspecific variations. | intra- and interspecific variations in female and male remating frequency, latency, and duration of copulation in first and second matings were analyzed in four species of the drosophila bipectinata complex, employing four strains of each species i.e. d. bipectinata, d. parabipectinata, d. malerkotliana and d. pseudoananassae. chi-square test revealed significant intraspecific variation in the number of remated females and males in d. malerkotliana and d. bipectinata, whereas d. parabipectinata ... | 2013 | 23518298 |
| developmental selection against developmental instability: a direct demonstration. | developmental selection, the non-random elimination of offspring during development, is hypothesized to alter the opportunity for selection on a given trait at later stages of the life cycle. here, we provide a direct demonstration of developmental selection against developmental instability, assessed as the incidence of minor, discrete phenotypic abnormalities in the male sex comb, a condition-dependent secondary sexual trait in drosophila bipectinata. we exposed developing flies from two geogr ... | 2013 | 23325737 |
| genetic basis of a violation of dollo's law: re-evolution of rotating sex combs in drosophila bipectinata. | phylogenetic analyses suggest that violations of "dollo's law"--that is, re-evolution of lost complex structures--do occur, albeit infrequently. however, the genetic basis of such reversals has not been examined. here, we address this question using the drosophila sex comb, a recently evolved, male-specific morphological structure composed of modified bristles. in some species, sex comb development involves only the modification of individual bristles, while other species have more complex "rota ... | 2012 | 23086218 |
| interspecific sexual isolation and phylogeny among different members of the drosophila bipectinata species complex. | the degree and pattern of sexual isolation among closely related species can be utilized for predicting the direction of evolution and deriving a phylogeny. the drosophila bipectinata species complex is a group of four morphologically very similar species, belonging to the ananassae subgroup of the melanogaster species group. sexual isolation among the members of this complex was studied by employing the male-choice technique. to test the difference between the homogamic and heterogamic matings, ... | 2012 | 22638827 |
| effects of age on female reproductive success in drosophila bipectinata. | female age influence on mating success, courtship activities, mating latency, copulation duration, fecundity, ovarioles number, and wing length has been studied using isofemale lines of drosophila bipectinata collected at three different localities. it was observed that in all localities, middle-aged d. bipectinata females had significantly greater mating success, showed less rejection responses to courting male, mated faster, copulated longer, and had greater fecundity and ovariole number than ... | 2011 | 22235980 |
| developmental instability as phenodeviance in a secondary sexual trait increases sharply with thermal stress. | we test for effects of thermal stress applied to pupal flies from noumea (new caledonia) and taipei (taiwan) on developmental instability (di) in the male sex comb of drosophila bipectinata, as well as on pre-adult survivorship and adult body size. the temperature treatments were low (25 °c), high (29 °c) and variable (18 h at 29 °c, 6 h at 34 °c). although the variable treatment reduced survivorship and body size, absolute comb size and fluctuating asymmetry generally were invariant across trea ... | 2012 | 22107054 |
| microscale laser surgery reveals adaptive function of male intromittent genitalia. | the leading hypothesis for the evolution of male genital complexity proposes that genital traits evolve in response to post-insemination sexual selection; that is, via cryptic female choice or sperm competition. here, we describe a laser ablation technique for high-precision manipulation of microscale body parts of insects, and employ it to discern the adaptive function of a rapidly evolving and taxonomically important genital trait: the intromittent claw-like genital spines of male drosophila b ... | 2010 | 20053645 |
| assessing the putative roles of x-autosome and x-y interactions in hybrid male sterility of the drosophila bipectinata species complex. | interspecific f1 hybrid males of the drosophila bipectinata species complex are sterile, while females are fertile, following haldane's rule. a backcross scheme involving a single recessive visible marker on the x chromosome has been used to assess the putative roles of x-autosome and x-y interactions in hybrid male sterility in the d. bipectinata species complex. the results suggest that x-y interactions are playing the major role in hybrid male sterility in the crosses d. bipectinata x d. para ... | 2007 | 17893743 |
| genetic interactions underlying hybrid male sterility in the drosophila bipectinata species complex. | understanding genetic mechanisms underlying hybrid male sterility is one of the most challenging problems in evolutionary biology especially speciation. by using the interspecific hybridization method roles of y chromosome, major hybrid sterility (mhs) genes and cytoplasm in sterility of hybrid males have been investigated in a promising group, the drosophila bipectinata species complex that consists of four closely related species: d. pseudoananassae, d. bipectinata, d. parabipectinata and d. m ... | 2006 | 16905873 |
| reproductive isolation among geographical populations of drosophila bipectinata duda (diptera, drosophilidae) with recognition of three subspecies. | among d. bipectinata duda, 1923, three subspecies, bipectinata from southeast asia (sea) and okinawa (okn), szentivanii stat. nov. from papua new guinea (png) and pacificiae ssp. nov. from south pacific ocean (spo), are recognized. the external morphology of the reproductive organs and the numbers of teeth per row in the sex combs are different between the three subspecies. furthermore, the sterility of hybrid males between strains from the different regions confirms the subspecies status of eac ... | 2005 | 16175456 |
| speciation in progress? a continuum of reproductive isolation in drosophila bipectinata. | incipient species in the early stages of divergence can provide crucial information about the genetic basis of reproductive isolation and the evolutionary forces that promote speciation. in this report, we describe two subspecies of drosophila bipectinata that show a continuum of reproductive isolation. crosses between strains of the same subspecies produce fully fertile offspring. at the same time, each subspecies harbors extensive variation for the degree of reproductive isolation from the oth ... | 2005 | 16175455 |
| a novel chimeric gene, siren, with retroposed promoter sequence in the drosophila bipectinata complex. | retrotransposons often produce a copy of host genes by their reverse transcriptase activity operating on host gene transcripts. since transcripts normally do not contain promoter, a retroposed gene copy usually becomes a retropseudogene. however, in drosophila bipectinata and a closely related species we found a new chimeric gene, whose promoter was likely produced by retroposition. this chimeric gene, named siren, consists of a tandem duplicate of adh and a retroposed fragment of cg11779 contai ... | 2005 | 16143626 |
| chromosomal phylogeny and geographical divergence in the drosophila bipectinata complex. | we have prepared reference polytene photographic maps as a standard sequence for the drosophila bipectinata complex using structurally homozygous flies derived from a stock of drosophila parabipectinata from brunei, borneo, in 1971. we found 87 inversions in the d. bipectinata complex and described their breakpoints on the reference maps. only 2 arrangements were shared interspecifically: 2r-ab was shared with 3 species, d. parabipectinata, d. bipectinata, and drosophila malerkotliana, and 3l-a ... | 2005 | 16121245 |
| evolutionary history of the drosophila bipectinata species complex. | groups of recently diverged species offer invaluable glimpses into the history and genetic basis of speciation and phenotypic evolution. in this report, we combine phylogenetic and population-genetic approaches to reconstruct the evolutionary history of the drosophila bipectinata species complex. this complex is a group of four closely related, largely sympatric species--d. bipectinata, d. parabipectinata, d. malerkotliana and d. pseudoananassae. using the sequences of one mitochondrial and six ... | 2005 | 16089034 |
| genetic basis of hybrid male sterility among three closely related species of drosophila. | the genetic basis of hybrid male sterility among three closely related species, drosophila bipectinata, d. parabipectinata and d. malerkotliana has been investigated by using backcross analysis methods. the role of y chromosome, major hybrid sterility (mhs) genes (genetic factors) and cytoplasm (non-genetic factor) have been studied in the hybrids of these three species. in the species pair, bipectinata--parabipectinata, y chromosome introgression of parabipectinata in the genomic background of ... | 2005 | 15900912 |
| environmental origins of sexually selected variation and a critique of the fluctuating asymmetry-sexual selection hypothesis. | identifying sources of phenotypic variability in secondary sexual traits is critical for understanding their signaling properties, role in sexual selection, and for predicting their evolutionary dynamics. the present study tests for the effects of genotype, developmental temperature, and their interaction, on size and fluctuating asymmetry of the male sex comb, a secondary sexual character, in drosophila bipectinata duda. both the size and symmetry of elements of the sex comb have been shown pre ... | 2005 | 15856700 |
| sexual selection for size and symmetry in a diversifying secondary sexual character in drosophila bipectinata duda (diptera: drosophilidae). | results of intrapopulation studies of sexual selection and genetic variation and covariation underlying elements of the sex comb of drosophila bipectinata are presented. the magnitude of the sex comb, a sexual ornament, varies significantly among australasian populations, motivating research into the evolutionary mechanisms responsible for its incipient diversification. the comb is composed of stout black teeth on the front legs of males arranged in three distinct segments: c1, c2, and c3. signi ... | 2004 | 15119443 |
| variability of morphological traits in drosophila bipectinata complex. | phenotypic or morphological differences among different populations and sexual dimorphism in certain metric traits were analysed in d. bipectinata complex. it was noticed that different populations of d. bipectinata species group harbour large amount of variation for these characters. in all the populations, morphometric characters such as lengths of femur, tibia and wing length, wing width, number of sternopleural bristles and bristles on epandrium varied significantly among populations. the st ... | 2000 | 12557913 |
| drosophila bipectinata species complex. | the drosophila bipectinata species complex belongs to the ananassae subgroup of the melanogaster species group (genus drosophila, subgenus sophophora). the members of the complex are: d. bipectinata, d. parabipectinata, d. malerkotliana, and d. pseudoananassae. of the four species, d. bipectinata is most widely distributed. females are indistinguishable, but males are distinguishable by their sex-comb teeth number and pattern and by abdominal colouration. chromosomal inversions have been detecte ... | 2001 | 11831362 |
| body size, mating success and advantage of large flies in drosophila bipectinata species complex. | mating success of large and small flies of drosophila malerkotliana and d. bipectinata was studied using multiple, male and female choice methods. in multiple choice method the large male mated with large female and small male paired with small female. in female choice method, large male was successful in mating with female irrespective of its size while in male choice method, preferential mating occurred between large male and large female as well as small male and small female. the consequence ... | 1997 | 9567772 |
| location and mapping of an autosomal recessive mutation causing unique phenotypic change in drosophila bipectinata. | in drosophila bipectinata, flies with bilateral outgrowths on thorax were detected in sepia eye colour mutant stock. such thoracic outgrowths have not been reported earlier in any species of drosophila and appear to be unique phenotypic change in d. bipectinata caused due to autosomal recessive mutation. by using a double recessive mutant stock (se og) and a wild type stock, crosses were made and on the basis of recombination data of f1 females, the og mutation was mapped on the second chromosom ... | 1997 | 9475083 |
| location and mapping of spontaneous mutations in drosophila bipectinata. | | 1997 | 9332175 |
| interaction between selection and genetic drift in laboratory populations of drosophila bipectinata. | to study the effect of selection and random genetic drift in laboratory populations of d. bipectinata, cut wing mutant and wild type stocks were crossed in several bottles. all the lines were maintained for several generations and in each generation the number of wild type and mutant flies was scored. based on the number of two types of males, the frequency of cut gene and its normal allele was calculated for different bottles since ct is a sex-linked mutation and males are hemizygous. interesti ... | 1997 | 9315218 |
| inversion polymorphism in natural populations of drosophila bipectinata. | inversion polymorphism was studied in seven natural populations of drosophila bipectinata, five from northern and two from southern india. chromosomal analysis of these populations revealed the presence of three paracentric inversions which are widespread in populations of d. bipectinata. quantitative data indicated that the frequency of inversions and the level of inversion heterozygosity were very low in populations of d. bipectinata. there is no evidence for genetic differentiation between po ... | 1996 | 9114499 |
| chromosomal variability and interracial hybridization in drosophila bipectinata. | three paracentric inversions, in(d)2l, in(c)2r and in(h)3l, often persist in laboratory stocks of drosophila bipectinata initiated from flies collected from natural populations. in order to test the effect of interracial hybridization on the degree of chromosomal variability, four stocks of d. bipectinata originating from different geographical localities and which were polymorphic due to the presence of three inversions, were crossed with each other. hybrid lines as well as parental lines which ... | 1995 | 8565620 |
| analysis of mitochondrial dna in two species of the bipectinata species complex of drosophila. | drosophila bipectinata and d. malerkotliana are members of the bipectinata species complex of the ananassae subgroup in the melanogaster species group of drosophila. the mtdna from 18 isofemale strains of these species was analyzed, using 13 restriction endonucleases. altogether, eight mtdna haplotypes were detected, of which the haplotype 1b was shared by the two species. restriction cleavage map of mtdna of these species was constructed. the net nucleotide substitutions per site calculated bet ... | 1993 | 8292389 |
| lack of correlation between mating activity and est-1 polymorphism in three natural and laboratory populations of drosophila bipectinata. | est-1 polymorphism and mating activity have been studied in three natural populations of d. bipectinata and after 10 generations of their maintenance in the laboratory. the results indicate that the enzyme est-1 variation was not significant within natural populations within f10 generation and also between different natural populations and f10 generation indicating the role of balancing selection in the maintenance of enzyme polymorphism in both natural and laboratory conditions. on the other ha ... | 1993 | 8500836 |
| no character displacement for reproductive isolation between drosophila bipectinata and drosophila malerkotliana. | to test whether character displacement for reproductive isolation between drosophila bipectinata and drosophila malerkotliana exists, the degree of sexual isolation was measured between their sympatric and allopatric populations. although the isolation indices vary in different crosses, the average isolation index for sympatric populations is very close to that for allopatric populations. this shows no difference in the degree of sexual isolation between sympatric and allopatric populations of d ... | 1991 | 1778468 |
| changes in nucleic acid content in aging drosophila bipectinata. | dna content decreases during first 20 and 25 days of survival in male and female flies of drosophila bipectinata respectively. rna as well as rna/dna content show a similar trend in males while in females both rise significantly during the first 5 to 10 days of survival followed by a steady decline till day 25. the study suggests that decreasing nucleic acid content of aging d. bipectinata is accompanied by the decline in protein synthesizing capacity. | 1984 | 6207042 |
| effect of butylated hydroxytoluene on the life span of drosophila bipectinata. | the median and the maximum life spans of drosophila bipectinata increased after feeding with various concentrations (10 microm, 10(2) microm and 10(3) microm) of butylated hydroxytoluene (bht). insects fed on the diet supplemented with 10(3) microm bht had decreased rate of lipid peroxidation (measured by thiobarbituric acid test) with respect to the controls. it is suggested that the antioxidant bht, which scavenges free radicals, prolongs the life span of drosophila. | 1983 | 6656301 |
| comparative study of alcohol dehydrogenase substrate specificities of drosophila bipectinata & d. malerkotliana. | | 1980 | 7000696 |
| intra- and interspecific chromosomal inversions in the drosophila bipectinata species complex. | | 1971 | 5096943 |