Fig. 3. QTL map for chromosome segment associated with blue mold resistance produced using interval mapping. Markers are indicated beneath the X axis with intervals between them indicated in centimorgans immediately above the X axis. The 1 – LOD confidence interval for the position of the QTL is indicated by the bold horizontal line above the X axis. The experiment-wise LOD threshold significance level determined using 1000 permutations of the procedure of Churchill and Doerge (1994) as implemented by WinQTLCart is indicated by the horizontal line crossing the Y axis at LOD = 1.23.