Quantitative Trait Qualitative trait Quantitative trait 80 Gaussian distribution 60 the bell-shaped curve 50 40 s30 20 10 130140150160170180190200 Height(cm)130 140 150 160 170 180 190 200 Height (cm) 80 70 60 50 40 30 20 10 Variability Gaussian distribution the bell-shaped curve Quantitative Trait Qualitative trait Quantitative trait