Before revision: Ancestry and ethnicity Genetic ancestry tests advertised by companies such as 23andMe and AncestryDNA do not actually reveal a person's geographical ancestral origins or determine their race and ethnicity .
After revision: , only useful estimates to genetic ancestry and population groupsAncestry and ethnicity Genetic ancestry tests advertised by companies such as 23andMe and AncestryDNA do not actually reveal a person's geographical ancestral origins or determine their race and ethnicity .