Zip codes for Dallas County-Texas. Zip codes for the Dallas County-Texas metropolitan area (as defined by the United States Census Bureau).
A quantitative trait locus (QTL) is a section of DNA (the locus) that correlates with variation in a phenotype (the quantitative trait).The QTL typically is linked to, or contains, the genes that control that phenotype.he simplest method for QTL mapping is analysis of variance (ANOVA, sometimes called marker regression) at the marker loci. In this method, in a backcross, one may calculate a t-statistic to compare the averages of the two marker genotype groups.
Your question should be framed differently. Each QTL is important, whether it has an overall negative or positive effect. You have to select the desirable allele of each QTL, whether it comes from parent A (poor) or B (superior). The poor parent may also carry a desirable allele for a QTL. It is not the QTL, but its desirable allele, which needs to be selected. Each QTL will have one desirable and the other undesirable allele. Sometimes the desirable allele of a QTL may be present in poor parent. I hope I have answered your question.