Population structure in Italy using ancient and modern samples

[Jovialis]

^^I knew my great-grandmother too. She watched me while my parents went to work, prior to me starting school. I also spent my whole child and teenage years with her in my life, which I was very fortunate for. She was 100% Barese and her grandparents were too.

[Palermo Trapani]

As I know they don't ask for birth or baptismal certificates. At least not always. Many times ancestry is simply self reported. And it is not always the researchers/geneticists directly who collect the samples, and samples are collected following very different procedures from time to time.

Well in my view, that is a potential flaw in the sample collection methods used if birth and/or baptismal certificates are not asked for.

[Pax Augusta]

Well in my view, that is a potential flaw in the sample collection methods used if birth and/or baptismal certificates are not asked for.

Definitely it is a potential flaw. Which is why academic samples are useful because they give us the big picture but they cannot always be taken for completely reliable when it comes to individual cases, especially the outlying ones, for the lack of control and strictness when they were collected. Because they may not always be completely accurate.

On the other hand, there is then to add the fact that there is individual variation, just see that often two brothers or sisters are not 100% identical genetically, so let alone two unrelated people who come from the same area, even when they really have all the grandparents from that area, it is not a given that they are entirely similar genetically.

[1337]

Why would this be the case? Northern Albania was more isolated during the migration age. The south should have higher Slavic/Gothic admixture. There is higher R1a and I2. I1 is more pocketed (Dibra has high % IIRC), but places like Vlore have like 15% I1 if I'm not mistaken.

Northern Albanians on average plot more north and it's an undisputed fact.