The occurrence and patterns of linkage disequilibrium between an inversion and allozymic loci within it or nearby have been used in attempts to discriminate among different hypotheses for the maintenance of variability. The interpretation of the data on the best-documented case, that of the nonrandom association between In(2L)t and alpha-Gpdh or Adh in the second chromosome of Drosophila melanogaster, has been done on the basis that recombination between alpha-Gpdh and Adh is almost entirely due to the recombination between In(2L)t and the locus within it (alpha-Gpdh), the recombination between the inversion and the nearby locus (Adh) being negligible. In this paper, we show that the pattern of recombination is just the opposite.
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http://dx.doi.org/10.1093/genetics/115.1.141 | DOI Listing |
Genetica
February 2007
Centre for Environmental Stress and Adaptation Research, Department of Genetics, University of Melbourne, Melbourne, Vic., 3010, Australia.
Drosophila melanogaster invaded Australia around 100 years ago, most likely through a northern invasion. The wide range of climatic conditions in eastern Australia across which D. melanogaster is now found provides an opportunity for researchers to identify traits and genes that are associated with climatic adaptation.
View Article and Find Full Text PDFGenet Res
February 2006
Centre for Environmental Stress and Adaptation Research, School of Biological Sciences, Monash University, Victoria 3800, Australia.
Latitudinal variation of the polymorphic sn-glycerol-3-phosphate (alpha-Gpdh) locus in Drosophila melanogaster has been characterized on several continents; however, apparent clinal patterns are potentially confounded by linkage with an inversion, close associations with other genetic markers that vary clinally, and a tandem alpha-Gpdh pseudogene. Here we compare clinal patterns in alpha-Gpdh with those of other linked markers by testing field flies from eastern Australian locations collected in two separate years. The alpha-Gpdh variation exhibited a consistent non-linear cline reflecting an increase in the alpha-GpdhF allele at extreme latitudes.
View Article and Find Full Text PDFBiochem Genet
October 2005
Department of Biology, Division of Genetics, Cell Biology and Development, University of Patras, Rio, 265 00, Patras, Greece.
Ten gene enzymic systems (alpha-GPDH, AO, MDH, ADH, LAP, SOD, ALP, ACPH, ME, and EST), corresponding to 12 genetic loci, were assayed from five Greek populations representing three subspecies of Apis mellifera, A. m. cecropia (Pthiotida, Kythira), A.
View Article and Find Full Text PDFHeredity (Edinb)
August 2004
Department of Evolutionary Zoology, University of Debrecen, Egyetem tér 1, Debrecen H-4010, Hungary.
Drosophila melanogaster samples were collected from a large population in two habitats: farmyards and distilleries. Samples were taken from two villages in each habitat. Three isofemale lines were established from all four samples and full-sib crosses were set in each isofemale line.
View Article and Find Full Text PDFEvolution
February 2000
University of Groningen, Haren, The Netherlands.
Many organisms show latitudinal variation for various genetically determined traits. Such clines may involve neutral variation and originate from historical events or their maintenance may be explained by selection. For Drosophila melanogaster, latitudinal variation for allozymes, inversions, and quantitative traits has been found on several continents.
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