Who should be the "Greek" component on genetic testing -- mainland or islanders?

[Myanthropologies]

I agree, but to me it is more accurate and truthful to have say, Macedonians and Thessalians coming up with Slavic, than to make Aegean islanders come out like as if they're Italians and not Greek.

You just WANT them to come up with Slavic and for south Italians to look more "ancient Greek" than them.

[arkas]

I agree, but to me it is more accurate and truthful to have say, Macedonians and Thessalians coming up with Slavic, than to make Aegean islanders come out like as if they're Italians and not Greek.

This is true.

There are common components which Greeks from all regions Mainlanders and Islanders often get in their top populations

For example Central Greek

To a degree, of course there are components that all Greeks share in common, but why not dissect even further if possible?

[Myanthropologies]

I think none of these options are good honestly. They should be able to place both Greek islands and Greek mainland under a general "Greek" label on the tests, then further distinguish between the island and mainland. None of the ethnicity labels on a DNA test ever contain a single component, they contain many components common in the population to maximize it to the population.

They also look for rare genetic variants rather than common genetic variants to define specific ethnic groups. Using rare genetic variants found in Ashkenazi helps distinguish them from Sicilians, so I am sure Greek Islanders have rare genetic variants that separate them from Sicilians, too. Likewise, there are rare genetic variants that separate Greek Balkan populations from other Balkan populations, too. If these companies looked for and found rare variants associated with both Greek Islanders and mainlanders, and incorporated them all into one big "Greek" label, that would be the most accurate.

[Sikeliot]

You just WANT them to come up with Slavic and for south Italians to look more "ancient Greek" than them.

That is not what I said. Most of the "European" ancestry in southern Italians is Greek, but there is also a native Italic element and a significant amount of Near Eastern and North African. Mainland Greeks are as much original pre-Slavic Greek as south Italians and Aegean islanders but plot north because the balance of their admixture is northern.

[Token]

That is not what I said. Most of the "European" ancestry in southern Italians is Greek, but there is also a native Italic element and a significant amount of Near Eastern and North African. Mainland Greeks are as much original pre-Slavic Greek as south Italians and Aegean islanders but plot north because the balance of their admixture is northern.

No evidence for that. Also, mainland Greeks have minimal Slavic ancestry, concentrated in the northeastern and border areas such as Thessaloniki.

[Borgias]

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Map of ancient tribes in Italy