Article Abstract:
Researchers investigated the power of associative overdominance in creating a correlation between individual heterozygosity and fitness and in maintaining genetic polymorphism at neutral loci. This was done by simulating a diploid model with five chromosomes. Various combinations such as population size, number of crossovers, selection coefficient, and dominance were used. All combination of parameter values resulted in positive regression, even though fitness differences were not large. The link between individual heterozygosity and fitness was clear for recessive mutations. The results showed that associative overdominance could help maintain polymorphisms in small populations.
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Article Abstract:
Researchers conducted a study to examine the relationship between heterozygosity at 11 variable isoenzyme loci and total above-ground leafless biomass production of four full-sib families of Salix eriocephala. These relationships were examined by comparing the performance of heterozygotes with that of corresponding homozygotes in locus-by-locus comparisons. These approaches indicated that the presence of positive associations between heterozygosity at enzyme loci and biomass production.
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Article Abstract:
Microsatellite polymorphism and genetic results of restocking Mediterranean brown trout (Salmo trutta L.) with hatchery stocks in the Orb River drainage of France are discussed. Genetic data from three microsatellite loci are considered after two wild populations, that of the main river, restocked yearly, and a tributary, not restocked for 6 years, were sampled.
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