I'm using eye color as an example here since CronoDAS mentioned it. Replace it with a particular gene, future time orientation, nose type or whatever. If society makes quantifiable claims about a particular category into which we slice up reality (ie Atheists are more likley to rape and murder!) an individual should have the right to either test or demand proof for this quantifiable claim.

Race is a pretty good proxy form which populations your ancestors came from. Its not perfect since for example the Black race has the most genetic diversity and geneflow has increased after the rise of civilization and especially globalisation. Knowing however, whether for example most of your ancestors lived outside of Africa for the last 60,000 thousand years or that your group of ancestors diverged from the other guys group of ancestors 40,000 thousand years ago is also relevant info.

I stole this graph from Razib's site (gene expression) for a quick reference of what current biology has to say about ancestral populations.

http://www.gnxp.com/wp/wp-content/uploads/2010/02/PIIS096098220902065X.gr2_.lrg_.jpg