Angela
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Everytime I see this kind of threads, I love when the usual idiot came out saying that medieval migrations did not change nothing.
Then I see this graph of IBD blocks sharing between populations from Ralph Coop et al. and I laugh.
Too bad that Southerners are overepresented in that cluster from the POPRES Database. They should be only 20% of the samples, but they are about 60%.
Please be so kind as to link to a Popres Database page which gives the geographic origin in Italy of each of its samples so that the 60% figure can be verified. You and Drac have an unfortunate habit of making general statements for which detailed links to sources are in short supply.
More importantly, I am not following your logic here. Ralph and Coop described a genetic cline in Italy based on blocks shared with people from other countries. There is a decreasing cline with the French speaking Swiss as you move south in Italy. Whether there are 10 or 50 samples from southern Italy, the pattern is the same, as would be expected from population history, isolation by distance and just common sense, not to mention the dozens of PCAs which show the same cline. Do I really have to post all of them as well?
I am sorry that you're not pleased with the fact that Neapolitans don't plot anywhere near Switzerland no matter the metric used, but facts are stubborn things. Take heart, maybe you have less "northern" ancestry than you might wish, but if Ralph and Coop are correct, and there was no significant change in the Italian genome after the "Celtic" migrations of around 500 BC, then there was minimal influence from the dreaded "Roman slaves" of any ancestry, including from the direction of Turkey.