"Whatever role genetics play in IQ are most certainly not manifested in the concentration of melanin in one's skin or the coarseness of one's hair or the color of one's eyes or the size of one's nose or any of the other crude heuristics we use to group people up as "races"."

You are making the case that intraracial facial structures all resemble each other, but internally how people are connected (brain structure) does not follow the same pattern. Some how over thousands of years of almost complete seperation, people managed to genetically grow different facial strucutres but stayed completely the same on the inside? The whole tenant of evolution is that great effective genes are passed on and reflected in offspring. By arguing that there is no genetic difference you are arguing that IQ cannot be passed on and that different environments did not select for and need different levels of IQ. If you are arguing that, then you are denying evolution as a theory.