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In numerous recent studies, the mitochondrial DNA of Greeks was examined and was found to be predominantly Caucasoid with only infrequent presence of "erratic" sequences from non-Caucasoid sources. Mitochondrial DNA ("mtDNA") is inherited from one's mother and is thus a good way to establish the maternal ancestry of a population.

The most comprehensive European-wide study of mtDNA is [1] in which 125 Greeks were sampled among thousands of Europeans. The Greeks and the Albanians appear in the "Mediterranean-East" category of the study. Greeks tested belonged overwhelmingly to the Caucasoid-specific haplogroups ("Seven Daughters of Eve" popularized by Bryan Sykes' book).

The "erratic" sequences include a Sub-Saharan African (L1a) sequence, which was derived from the Albanian part of the sample [2]. The other two sequences non-attributed to a European founder are members of haplogroups prevalent in Asia, M and D. Thus, the total percentage of erratics in the Greek sample was 1.6%. The Greeks, like most Europeans are fairly pure in terms of their maternal ancestry.

It is sometimes argued that the Greeks absorbed large numbers of Negro slaves or immigrants. There is no evidence of such an event in Greek mtDNA. If it ever took place, it was so limited in scope that not a single sequence in a total of 125 could be found.

The number of non-European sequences in the rest of Europe is also small, while in the Near East it is about 5%, only slightly larger. One can easily verify that Sub-Saharan African admixture (L sequences) has been detected in Scandinavia (Sweden, Norway and Iceland - 0.6%), Southeastern Europe (Bulgaria/Romania - 0.5%), Central Mediterranean (Italy and Sardinia - 1.7%; mostly in Sardinia), the Mediterranean West (Spain and Portugal - 3.7%), North Central Europe (Poles, Czechs, Germans, Danes - 0.9%), North Western Europe (Britain, Ireland and France - 0.4%). In another recent study [3] on Norwegians, an L2 Sub-Saharan African sequence was found in the sample of 74 Norwegians (1.4% Sub-Saharan admixture). Finally [4] showed 0.5% to 1.2% introgression of Sub-Saharan African genes into the European American gene pool.

The main conclusion to be drawn from these studies, is that Caucasoids of European descent have negligible traces of non-Caucasoid maternal admixture. Sub-Saharan African traces of such ancestry are found at levels of about 1% in many populations. But not in Greeks(a).