FIG. 5.
Tajima's D statistic for coding and noncoding regions in Africans and non-Africans. African populations that share genetic and linguistic similarity were grouped together as follows: Niger–Kordofanian speakers (NK), Nilo-Saharan speakers (NS), Afroasiatic speakers (AA), and Khoesan speakers (KS). Some genetically distinct populations within language families were classified as separate groups (e.g., Fulani Niger–Kordofanian speakers, Pygmy Niger–Kordofanian speakers, and Luo Nilo-Saharan speakers) based on a recent genetic study (Tishkoff et al. 2009). Statistically significant (P < 0.05) DT values are denoted by (*) and marginally significant (0.05 < P < 0.1) DT values are denoted by (#).