QTL analysis of zll-1 x Ler/Col Recombinant Inbred Lines. A. Frequency distribution plot of stem cell termination phenotypes in the F2 progeny of 101 crosses between Ler zll-1 and 99 RILs, Ler-0 and Col-0. B. Chromosome-wide Logarithm of the Odds (LOD) scores of QTL influencing stem cell termination. The horizontal line indicates the significance threshold and marker positions are shown below each plot. LOD values and significance thresholds were determined using PlabMQTL software.