The following is a guest blog post by Sarah Abel, author of Permanent Markers: Race, Ancestry, and the Body after the Genome. Over the past twenty years, DNA ancestry testing has morphed from a niche market into a booming international industry that encourages members of the public to answer difficult questions about their identity by looking to the genome. At a time of intensified interest in issues of race and racism, the burgeoning influence of corporations like AncestryDNA and 23andMe has sparked debates about the commodification of identity, the antiracist potential of genetic science, and the...