Only autosomal DNA (full ancestry) influences phenotype. Haplogroups are useful in providing information on ancient migrations, primarily.
In the case of Greece, Dienekes did a pretty good job showing how haplogroup frequencies match fairly well autosomal percentages. Here are the autosomal percentages from the
K=12 admixtures from the Dodecad Project for the Greek members :
- West European : 13% (matches the 12% of R1b)
- East European : 12% (matches the 12% of R1a)
- West Asian : 25% (matches the 25% of J2)
- Mediterranean : 43.5%
- Southwest Asian : 5.5%
- North & East African : 0.5%
Mediterranean is a very wide and ambiguous category, that is found at high levels (between 25% and 50%) from populations as diverse and unrelated as the Moroccans, Portuguese, Basques, Italians, Hungarians, Turks, Lebanese and Iraqis. Moroccans are almost exclusively E1b1b, while Basques are R1b, Sardinians mostly I2a1 and G2a, and Iraqis are predominantly J1 and J2. In the Greeks, it surely includes most of the I2 and E1b1b, and perhaps also some G2a and J2. The Southwest Asian component would include J1, T and some E1b1b.
In any case, even Egyptians have 23% of Mediterranean. There is no data for Tunisians and Algerians, but I am sure it is over 25%. It would be interesting to try to split this Mediterranean element in order to differentiate the E1b1b+T+J1 admixture from the I2a+G2a. I wouldn't be surprised if Greeks were about half-half for each, probably with a slight bias towards the former. Everything else matches...