One-third of South Africans carry this marker, named after the speech with clicking sounds believed to have been early humans’ first language. Overall, 1 in 2 Africans or African Americans has it. Namibia boasts its highest frequency—36%. 1 in 6 Melungeons exhibits the gene. It is found at low levels in Asian and Native American populations and is present also in Austronesia and Australia, so it is universal in its distribution (13% worldwide).
