As an aside, when I was a kid we used to experiment with mixing different soft drinks to see how they tasted, and when we mixed Seven-Up with Coca-Cola and a little root beer the result tasted almost exactly like Dr. Pepper. So we figured that's probably how they came up with the recipe.
In the evolutionary cartoon, I think it would show three people drinking Coke, Seven-Up and root beer leading to one person drinking Dr. Pepper. Not really an illustration of evolution in the conventional sense, maybe more an illustration of hybrid vigor.
