Have you read the article Recovering linked for you? Did it answer your questions?
To get more of an appreciation for how this works you need to read an introduction to evolutionary developmental biology - often shortened to "evo devo".
One of the most accessible books on that is "Endless Forms Most Beautiful" by Sean B. Carroll although I warn you it's not an easy read. The detail of how genes control the development of anatomical features is brilliant.
Edited to add - your sophomoric attitude makes conversation very difficult Perry.