Is Racism Innate?

I would like to believe that racism has to be learned. There's a song that says so.  But what if a tendency toward racism is innate?  

Darwin realized that species change through natural selection in a challenging world. Back when humans had real races, Homo sapiens encountered the Neanderthals in Western Asia and Europe. Neanderthals were human but different. It may be that when a Homo sapiens had to chose between one race or another, she favored the one who looked like her. This bias would have had survival value for her kind. Over time the relatively few Neanderthals disappeared, although many people today carry a few of their genes.

Some cognitive scientists believe that we are genetically programmed to prefer people who look like us or who share our ways--the blonde graduates of Duke may favor their own kind. In general people do not like difference. Small children may suddenly fear--for no apparent reason--adults who look different from their parents. 

But cognitive scientists argue that we aren't doomed to be racist. We can learn anti-racism in the same way that we learn to control our tempers.