All that is not to say that racism is justifiable, of course. The fact that we are big-brained as a species and live by rational thought means that we can choose to over-ride natural inclinations of that sort. Afterall, they would be fairly weak inclinations. We just need to be encouraged a bit, I expect. Possibly through philosophical ideas of equality and fairness, carried by a political system.
Yes, evolutionary science illustrates the biological process involved in the formation of the human and non-human animal species. And the survival behaviour characteristics which have been passed on, through 'natural selection'.
Nevertheless, a combination of factors constitute to the shaping of 'personality and aptitudes'. Genetics alone can never be more than part of the story. Whilst behaviour geneticists identify 'Molecular genetics' as a significant study in explaining how genes (in this particular dimension) influence individual differences, there's no evidence that suggests we're "taught" to hate because of these various differences. Ergo, 'nurture and nature' are intertwined, but behaviour is also observed, imitated and 'taught' - through social constructionism.
Is that actually true? Aren't we born to favour kin first, then kin-bonding, then tribe, and so on?
There hasn't been a lot of discussion here about the other material surrounding C4's series. My understanding was that Jane Elliott was referring to the process of institutionalising prejudice, and there's a C4 article about it at: http://www.channel4.com/progra...you-calling-a-racist
If we're inclined to in-group/out-group thinking and behaviour then all it takes is for someone to be different. I suspect myself that we're biologically inclined to that sort of thinking. It's then a matter for us to rise above it. That's the opposite of thinking we'd all get on like a house on fire if only we were not taught as we grow up to think in group terms - racial or ethnic group terms in this case.