Some genes controlling human diseases have been located on the regions less than 1 cM using linkage disequilibrium, and a few of them have been cloned. Z. W. Luo developed a method that can detect and estimate the coefficient of linkage disequilibrium between a marker locus and quantitative trait locus (QTL), and raised the theoretical strategies for high-resolution mapping of complex genetic disorders in humans. Based on the data mentioned above, a method for linkage test between a marker locus and QTL was set up, and a method for linkage test between two marker loci and epistatic QTL was suggested for the first time.
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