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They discovered that commonly used ethnic labels did not match the genetic clusters and were not reliable at predicting variation in the DME genes. One glaring lack of correspondence was the fact that 62 percent of Ethiopians, who would socially be labeled as black and grouped with the Bantu and Afro-Caribbeans, fell in the same genetic cluster as Ashkenazi Jews, Norwegians, and Armenians. A gene variant involved in metabolizing codeine and antidepressants “is found in 9%, 17%, and 34% of the Ethiopian, Tanzanian, and Zimbabwean populations, respectively.”41 The prevalence of an allele that predicts severe reactions to the HIV-drug abacavir is 13.6 percent among the Masai in Kenya, but only 3.3 percent among the Kenyan Luhya, and 0 percent among the Yoruba in Nigeria.42 Grouping all these people together on the basis of race for purposes of drug tailoring would be disastrous.
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Dorothy Roberts (Fatal Invention: How Science, Politics, and Big Business Re-create Race in the Twenty-First Century)