scholarly journals Chromosomal polymorphism in Drosophila subobscura populations from Barcelona (Spain)

1964 ◽  
Vol 5 (1) ◽  
pp. 27-38 ◽  
Author(s):  
Antonio Prevosti
Keyword(s):  
Chromosomal Polymorphism ◽  
Drosophila Subobscura ◽  
Marginal Populations ◽  
Seasonal Differences ◽  
Present Evidence ◽  
Two Populations

1. Chromosomal polymorphism in two populations of D. subobscura from Barcelona has been analysed and compared with the polymorphism which has been reported from other populations.2. In spite of microclimatic differences between the Barcelona sites, there is no evidence of differences in the frequency of inversion types nor of seasonal differences within one of these sites.3. Regularities in the array of frequencies of chromosomal types in Barcelona and other populations suggest that the polymorphism is mainly adaptive although there is also evidence of differences due to distance which are not obviously associated with differences in habitat.4. In general the index of free recombination gives higher values in the marginal populations of D. subobscura, but further data are needed to arrive at a definite conclusion on this point since the present evidence is rather ambiguous.

GENETIC COADAPTATION IN THE CHROMOSOMAL POLYMORPHISM OF DROSOPHILA SUBOBSCURA. I. SEASONAL CHANGES OF GAMETIC DISEQUILIBRIUM IN A NATURAL POPULATION

Genetics ◽  
1983 ◽  
Vol 105 (4) ◽  
pp. 935-955
Author(s):  
A Fontdevila ◽  
C Zapata ◽  
G Alvarez ◽  
L Sanchez ◽  
J Méndez ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Natural Selection ◽  
Gene Order ◽  
Seasonal Changes ◽  
Chromosomal Polymorphism ◽  
Drosophila Subobscura ◽  
Gene Arrangement ◽  
Gametic Disequilibrium ◽  
Present Evidence ◽  
Data Points

ABSTRACT Seasonal changes in gene arrangement and allozyme frequencies have been investigated in Drosophila subobscura for several years. Some arrangements (Ost and O  3+4+7) show seasonal variation, which suggests that chromosomal polymorphism is flexible in this species. Seasonal changes in allozyme frequencies for Lap and Pept-1 loci, both located within the same inversions of chromosome O, are significant only inside the Ost arrangement, but not inside O  3+4 arrangement. This arrangement-dependent response of allozyme generates variation in arrangement-allozyme disequilibrium. The historical hypothesis on the maintenance of disequilibria cannot explain these seasonal changes, and some kind of natural selection must be invoked. Association between Lap and Pept-1 is also seasonal inside Ost but not inside O  3+4. We propose that Ost probably consists of a finite array of supergenes that are differentially favored in each season by natural selection. The present evidence on this supergene selection and other genetic, biogeographic and phylogenetic data points to O  3+4 as the most primitive gene order among the present arrangements

scholarly journals Structural polymorphism in Drosophila subobscura Coll. from various localities in Scotland

1961 ◽  
Vol 2 (1) ◽  
pp. 1-9 ◽  
Author(s):  
G. R. Knight
Keyword(s):  
Western Europe ◽  
Central Area ◽  
Small Chromosome ◽  
Drosophila Subobscura ◽  
Structural Polymorphism ◽  
North Central ◽  
The North ◽  
Break Points ◽  
Two Populations ◽  
Local Race

1. Gunson's salivary chromosome preparations of Drosophila subobscura from widely separated sites in Scotland have been re-examined and inversions recorded according to the Mainx nomenclature.2. Sixty-four diploid sets only were available. Of these, thirty-seven sets were found to be structurally homozygous on all chromosomes.3. From Drumnadrochit in the north-central area of Scotland, the inversion found on the E-chromosome, so far as is known, has not previously been described. Its break-points have been noted, and the inversion is named E14.4. A strain of D. subobscura from the small western island of Iona was the only one found to be completely homozygous in the five long arms of the chromosome set.5. Samples of D. subobscura from two closely related localities in Midlothian, Scotland, also have been examined. Results are based on the analysis of 120 haploid sets in hybrids between the local race and the standard Küsnacht stock.6. A slight difference in type and frequency of inversions has been noted between the two populations. The inversion E1+2 was recorded from Dalkeith, but was absent at Heriot, while U1, present at Heriot, was replaced by UST at Dalkeith.7. The A-chromosome was structurally homozygous throughout.8. Scottish samples of D. subobscura are characterized by their qualitative simplicity of polymorphism, the variety of inversion types being small. Chromosome orders analysed have been compared with those occurring in Western Europe and Israel.

Biological characterization and mating compatibility of Helicoverpa gelotopoeon (D.) (Lepidoptera: Noctuidae) populations from different regions in Argentina

2017 ◽  
Vol 108 (1) ◽  
pp. 108-115 ◽  
Author(s):  
M.I. Herrero ◽  
S.V. Fogliata ◽  
A. Vera ◽  
A. Casmuz ◽  
D. Sosa Gómez ◽  
...  
Keyword(s):  
Genetically Modified Crops ◽  
South American ◽  
Reproductive Parameters ◽  
Biological Characterization ◽  
Present Evidence ◽  
Migratory Capacity ◽  
Mating Compatibility ◽  
American Bollworm ◽  
Lepidoptera Noctuidae ◽  
Two Populations

AbstractHelicoverpa gelotopoeon, the South American bollworm, is a polyphagous pest of the Heliothinae complex that causes damage to soybean, cotton, and chickpea crops. Some species within this complex have developed resistance to genetically modified crops and insecticides, which has led to increased interest in their genetic diversity and population structure. The objective of this study was to characterize biological and reproductive parameters of two populations of H. gelotopoeon collected in two different provinces of Argentina. Intra- and inter-population crosses revealed that H. gelotopoeon populations from both regions of Argentina did not present evidence of pre-zygotic and post-zygotic incompatibility, suggesting that Tucumán and Córdoba populations of H. gelotopoeon belong to a single wide-ranging species. Our data support the occurrence of substantial gene flow between H. gelotopoeon populations, probably due to the widely documented, long-range migratory capacity of Heliothinae species.

scholarly journals Revision of the banding sequence pool and new data on chromosomal polymorphism in natural populations of Chironomus agilis Shobanov et Djomin, 1988 (Diptera, Chironomidae)

2021 ◽  
Vol 15 (4) ◽  
pp. 527-541
Author(s):  
Veronika V. Golygina ◽  
Oksana V. Ermolaeva
Keyword(s):  
Qualitative Analysis ◽  
Natural Populations ◽  
Chromosomal Polymorphism ◽  
B Chromosomes ◽  
Medium Level ◽  
Banding Sequence ◽  
First Time ◽  
Two Populations

Quantitative and qualitative analysis of chromosomal polymorphism in 19 natural populations of Ch. agilis had been performed. Most studied populations showed a medium level of chromosomal polymorphism: on average 45±3.0% of specimens are heterozygotes with 0.52±0.01 heterozygotic inversion per larvae. Besides inversions, B-chromosomes were found in two populations. The total number of banding sequences found in banding sequence pool of Ch. agilis is 16. Three banding sequences – p’agiB3, p’agiD3, p’agiF3 – are described for the first time.

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