Quantitative Trait Loci

The file “Homework 6 Data.xlsx” contains the results of a QTL analysis of stem rust severity (%) for wheat chromosome 3B.  The analysis used homozygous inbred lines from a resistant parent × susceptible parent cross, and a SNP-based chip for wheat.  The mean disease severities for both parental genotypes at each of >200 marker locations, as well as the significance (-log10 p-value) of the marker-phenotype associations, are provided.

•How many quantitative loci can be identified? What is their estimated location and effect size?