Figure 2.4b from the previous parent node as shown below demonstrates a concept in evolutionary biology known as the Hardy-Weinberg Equilibrium, which states that the stability of genetic variation will remain constant from one generation to the net given no further confounding factors. Under the Galton Board model, a certain trait that is heritable should accrue or continue to build from generation to generation, leading to changing distributions from one generation the next. However, H-W Equilibrium states that element of chance exists in how the genes inherited will be expressed (i.e. tall father having a shorter son or vice versa), leading to the distribution ultimately evening out as in the previous generation barring major disturbances.