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  • 1
    Electronic Resource
    Electronic Resource
    Effects of allozyme variation on fitness components in Drosophila melanogaster (1983)
    Springer
    Genetica 62 (1983), S. 139-146 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have explored in Drosophila melanogaster the fitness effects of allelic variation at three enzyme loci: α Gdh, Adh, and Acph. Viability and rate of development are studied at two densities, near-optimal and competitive. No genotypic effects could be demonstrated on rate of development at either density or on viability under optimal conditions. Small but significant effects on viability appear under competitive conditions. Fecundity is measured for all nine possible mating combinations between the three female and the three male genotypes at each locus. Female genotype has important fitness consequences; heterosis exists at every locus. Male genotype also contributes to fitness, but without heterosis. There are significant interactions between female and male genotypes, so that the fecundity of a mating combination cannot be determined from the average fitnesses of the female genotype and the male genotype involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00116635
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Geographic dispersion and varietal diversity in Vicia faba L. (1993)
    Springer
    Genetic resources and crop evolution 40 (1993), S. 143-151 
    Details
    ISSN: 1573-5109
    Keywords: electrophoresis ; crop evolution ; faba bean ; geographical isolation ; germplasm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Twenty-six faba bean (Vicia faba L.) populations, from five geographic areas and five varietal types have been assayed electrophoretically for variation in seven isozyme systems. Isozyme frequencies in populations, botanical varieties and geographical areas were submitted to the principal component analysis (PCA). Varieties grouped together showed no differences among them except for isolated populations. Populations from Ethiopia and China lay far apart in PCA from those of other origins. It seems that no genetic divergence at the isozyme level took place during the varietal formation and dispersion process, except when geographical isolation of the population occurred. The results support the hypothesis of an isolation of the crop in Ethiopia and in China.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051119
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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