An investigation of the influences of marked chromosome sections on quantitative traits in a backcross-generation with 2321 mice (C57BL/6JHan × (AKR/NHan×C57BL/6JHan)) is described. In the animals the chromosomes 1, 4, 7, and 8 were marked by the gene loci Idh-1, Gpd-1, Gpi-1s, Es-1, resp. Within the backcross-generation, for Idh-1 and Es-1, more heterozygous genotypes were found than expected under random conditions. By comparing animal-groups with different homologous sections of the marked chromosomes, effects were observed on quantitative traits (body length and weight, dry weight and matter, fat weight and content). The results indicate that a few chromosome sections influence to a major extent the genetic variation of some quantitative traits.
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