How well can 23andMe distinguish Iberian and Northern Italian?

[pmokeefe]

There's a case on FB of a Brazilian who believes her great-grandfather's parents immigrated from North Italy: Veneto and Marche respectively. 23andMe only assigns her 1.4% broadly Southern European and 64% Spanish and Portuguese, mainly Portuguese, but 0% Italian.

How well can 23andMe distinguish Iberian and Northern Italian?

[Cascio]

Is inheritance not whole random and we are talking about a great-grandfather after all.

[pmokeefe]

Is inheritance not whole random and we are talking about a great-grandfather after all.

According to this 23andMe page Average Percent DNA Shared Between Relatives the range for great-grandparents is 4% - 23%.

[Cascio]

According to this 23andMe page Average Percent DNA Shared Between Relatives the range for great-grandparents is 4% - 23%.

I don't have great faith in 23andMe to be honest.

[pmokeefe]

I don't have great faith in 23andMe to be honest.

ISOGG gives a range of 485-1486 cm for great-grandparents.
Another source for great-grandparent sharing: https://dna-explained.com/2020/01/14...-grandparents/

[Ruderico]

I'm yet to see an Iberian with any meaningful levels of Italian, from my experience they separate the two quite well, but for something that distant who knows.

[Luso]

I'm yet to see an Iberian with any meaningful levels of Italian, from my experience they separate the two quite well, but for something that distant who knows.

Seems like we rlly tried to avoid them Iberian tribes said no to intermingling and rape true warrior spirit

In seriousness, I've expected some very roman based samples with italic like admixture and suprised as well. Where did Romans settle the most in western Iberia? South, central, or north?

[Luso]

There's a case on FB of a Brazilian who believes her great-grandfather's parents immigrated from North Italy: Veneto and Marche respectively. 23andMe only assigns her 1.4% broadly Southern European and 64% Spanish and Portuguese, mainly Portuguese, but 0% Italian.

How well can 23andMe distinguish Iberian and Northern Italian?

Sounds like a family tale for her family. Or rather, a confusion...I got many in my family and we are fully Portuguese from the south. Ie: connections to Naples Italy, askanazi Jews, Denmark, etc. all just from oral mouth over generations

But again, if you remember my dad got a 6.2% Italian result. I posted a thread ab it.. on all calculators, other commercial tests it doesn't appear aside from 23andMe. So it is true it can happen but I doubt to the extent that it did for that woman.

[Ruderico]

Seems like we rlly tried to avoid them Iberian tribes said no to intermingling and rape true warrior spirit

In seriousness, I've expected some very roman based samples with italic like admixture and suprised as well. Where did Romans settle the most in western Iberia? South, central, or north?

The most romanised areas were South and along the coastline, even in the north, for instance Braga was a very important city in the region. It was the poorer and most remote areas that attracted the least attention. That said the whole country was thoroughly romanised, but how much of this was accompanied by non-local citizens I don't know - and I don't think anyone really does, which is why we have these ancient population genetics studies for us to enjoy

[Hrodric]

There's a case on FB of a Brazilian who believes her great-grandfather's parents immigrated from North Italy: Veneto and Marche respectively. 23andMe only assigns her 1.4% broadly Southern European and 64% Spanish and Portuguese, mainly Portuguese, but 0% Italian.

How well can 23andMe distinguish Iberian and Northern Italian?

I think this one of those cases where a brazilian wants to claim some kind of italian heritage so badly... at least that's my perception that a lot of brazilians want to claim italian, german, or dutch heritage.