Mapping quantitative trait loci

Different alleles at quantitative trait loci (QTL) cause genetic differences between individuals and families for quantitative traits (Bulmer 1980; Falconer 1981). QTL genotypes cannot be determined by inspecting the distributions of trait phenotypes alone. This is one of the fundamental problems of quantitative genetics. Historically important quantitative genetic parameters, e.g., additive genetic variance and heritability, summarize differences between alleles at QTL, but do not shed light on the genetics of QTL. Methods for mapping QTL are needed to achieve this. QTL are mapped by using genetic markers linked to QTL to draw inferences about differences between alleles at QTL.

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