The chromosomes of two Drosophila races: D. nasuta nasuta and D. nasuta albomicana

Ramachandra, Nallur B.; Ranganath, H. A.

doi:10.1007/bf00292744

Cited by 34 publications

(31 citation statements)

References 10 publications

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“…D. n. albomicans has 2 n = 6, consisting of two pairs of metacentrics, one of the pair representing the fused products of chromosome 3 and X or Y (in male) and the other pair, chromosome 2. The chromosome 4 in this species is represented by two long dots (Wilson et al, 1969;Ramachandra & Ranganath, 1986b). We exploited the cross fertility of D. n. nasuta and D. n. albomicans to conduct interspecific crosses for the autosomal localization of bw mutation.…”

Section: Resultsmentioning

confidence: 99%

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Ashadevi

Ramesh

2000

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By analyzing the progeny of crosses involving brown eye mutants and the wild types in two members of Drosophila nasuta subgroup namely D. n. nasuta and D. n. albomicans we could show that the mutant gene is recessive, located in the chromosome 2 and the alleles of this gene are present at different loci. A study of fitness in the eye color mutants in comparison with the wild types revealed that D. n. nasuta mutant has higher viability at both 25 ± 1 • C and ambient temperatures; while D. n. albomicans mutant has faster rate of development only at 25 ± 1 • C. Quantitative analysis of eye pigments in the mutants revealed that there is biosynthesis of both pteridines and xanthommatins unlike in bw/bw of D. melanogaster, where only xanthommatins are synthesized. In both the species, the pteridine quantities in mutants are similar; whereas xanthommatin quantity in bw n /bw n is 10 times higher than that of bw a /bw a . Further, the F 1 progeny of intraspecific crosses (wild type X mutant) are found to have high amounts of pteridine, even when compared with parental wild type.

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Section: Resultsmentioning

confidence: 99%

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Ashadevi

Ramesh

2000

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“…(i) D. n. nasuta (Coorg, South India), (ii) D. n. albomicans (Okinawa, University of Texas collections, 3045.11), (iii) Cytorace 1 (Ramachandra & Ranganath 1986).…”

Section: Methodsmentioning

confidence: 99%

“…This is an assemblage comprising of Drosophila nasuta nasuta (♂ 2n = 8: 2 n 2 n 3 n 3 n X n Y n 4 n 4 n , ♀ 2n = 8: 2 n 2 n 3 n 3 n X n X n 4 n 4 n ), Drosophila nasuta albomicans (♂ 2n = 6: 2 a 2 a X3 a Y3 a 4 a 4 a , ♀ 2n = 6: 2 a 2 a X3 a X3 a 4 a 4 a ) and 16 Cytoraces, which are the evolutionary product of a long range hybridization experiment. Cytorace 1 (♂ 2n = 7: 2 a 2 n Y n X3 a 3 n 4 n 4 n , ♀ 2n = 6: 2 a 2 n X3 a X3 a 4 n 4 n ), is the product of hybridization between the males of D. n. nasuta (Coorg, South India) and females of D. n. albomicans of Okinawa strain (Ramachandra & Ranganath 1986). The occurrence of a rare event of centric fission in a laboratory population of Drosophila, Cytorace 1, has been reported by Tanuja et al (1999).…”

Section: Introductionmentioning

confidence: 99%

Genomic introgression in laboratory evolved hybrid races, Cytorace 1 and Fissioncytorace-1 ofNasuta-albomicanscomplex (NAC) ofDrosophila(Insecta, Diptera) as revealed by RAPD and ISSR markers

Thongatabam

Ramachandra

2012

Italian Journal of Zoology

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Nasuta-albomicans complex (NAC) of Drosophila is an artificial hybrid zone comprising of Drosophila nasuta nasuta, Drosophila nasuta albomicans and 16 Cytoraces, which are the evolutionary products of a long range hybridization experiment conducted in the laboratory environment. Occurrence of centric fission in the X3 chromosome of Cytorace 1 led to the derivation of Fissioncytorace-1. Molecular techniques have emerged as powerful and valuable tools for detection and exploitation of genetic polymorphism. In the present study, Cytorace 1 and Fissioncytorace-1 were subjected to Random Amplified Polymorphic DNA (RAPD) and Inter Simple Sequence Repeats (ISSR) analyses to determine the introgression of D. n. nasuta and D. n. albomicans genomes. It was found that Cytorace 1 and Fissioncytorace-1 exhibit similarities in RAPD and ISSR profiles although different combinations of genomic regions could have favoured Fissioncytorace-1, for better morphophenotypes and fitness, when compared to Cytorace 1, which has existed for over 15 years from the time of its evolution in the laboratory environment.

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“…In several cases the dose relationship of the members allows for the obtainment of fertile hybrid progeny (cf: Ramesh & Rajasekarasetty, 1980;Ramachandra & Ranganath, 1986).…”

Section: Introductionmentioning

confidence: 99%

“…Females of this subgroup are morphologically indistinguishable, while the males have silvery markings on the frons, the extent of which varies (Nirmala & Krishnamurthy, 1972). Taxonomic identification of species obtained in the wild as well as those from population genetic studies have so far been based on cytological investigation (metaphase plates, polytene chromosomes), or hybridization studies (Ramachandra & Ranganath, 1986).…”

Section: Introductionmentioning

confidence: 99%

Taxonomic identification of Drosophila nasuta subgroup strains by glue protein analysis

Ramesh

Kalisch

1986

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Protein fractions of salivary glands were analyzed from 30 wildtype strains of eight species belonging to the Drosophila nasuta subgroup by SDS-polyacrylamide gel electrophoresis. The electrophoretic patterns indicated several prominent bands which could be shown to represent the major glue protein fractions. The glue protein fractions are species-specific as well as wildtype strain-specific. Wildtype strain specificities are characterized by variations of the species-specific patterns. The patterns of the different wildtypes, species, and hybrids were used for taxonomic identification within the nasuta subgroup, in which the females are morphologically indistinguishable and the males differ only by the markings of their frons. The hybrids provide evidence for gonosomal as well as autosomal linkage of individual genes coding for the major glue protein fractions.

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The chromosomes of two Drosophila races: D. nasuta nasuta and D. nasuta albomicana

Cited by 34 publications

References 10 publications

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Genomic introgression in laboratory evolved hybrid races, Cytorace 1 and Fissioncytorace-1 ofNasuta-albomicanscomplex (NAC) ofDrosophila(Insecta, Diptera) as revealed by RAPD and ISSR markers

Taxonomic identification of Drosophila nasuta subgroup strains by glue protein analysis

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