Population genetic structure and colonization sequence of Drosophila subobscura in the Canaries and Madeira Atlantic Islands as inferred by autosomal, sex-linked and mtDNA traits

Article Abstract:

A study on the population genetic structure and colonization sequence of Drosophila subobscura localized in the Canarian Archipelago and Madeira Atlantic Islands was carried out using chromosomal, enzymatic and mitochondrial DNA (mtDNA) analytical techniques. The results indicated that whereas the Canary Islands have long been isolated, the Madeira Atlantic Islands have been subjected to continuous migration from the mainland. It was also shown by the data on sex-linked allozymes and mtDNA that there is a large divergence between the geologically younger western islands of the Canaries and the older central ones.

Analysis, Usage, Statistics, Statistics (Data), Mitochondrial DNA, Population genetics, Enzymatic analysis, Colonization

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Selection for canalization at extra dorsocentral and scutellar bristles in Drosophila melanogaster

Article Abstract:

Research was conducted to prove that output for selection for canalization of Drosophila melanogaster depends on the total number of bristles per region, each region being an independent component of development canalization. Direct artificial selection was used. Canalization at the extra dorsocentral and scutellar bristles of the species were observed. Variations in the degree of canalization between the two bristle systems were noted. The results affirmed the dependency of selection on bristle frequency per region.

Phenotype, Phenotypes

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Stable Drosophila buzzatii-Drosophila koepferae hybrids

Article Abstract:

High rates of chromosomal rearrangements have been found in the progeny of males containing a telomeric segment of Drosophila koepferae in a D. buzzatii genetic background. Experiments were conducted to determine whether this chromosomal instability could be elucidated by a phenomenon similar to P-M hybrid dysgenesis or by a generalized telomeric effect. Findings indicated that chromosomal instability is independent of the introgressed fragment.

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