La traduction française ne semble pas très complète. L’original en anglais :
"Roman redistribution
It is most likely that G2a arrived in Europe during the Neolithic or the
Bronze Age and that the Romans helped spread it around, the whole of
Italy being relatively rich in G2a. Migrations within the Roman Empire
probably contributed to a moderate increase of G2a northward to Gaul and
Britain, Indeed, the frequency of haplogroup G decreases with the
distance from the boundaries of the Roman Empire. Haplogroup G is
extremely rare Nordic and Baltic countries nowadays, despite the fact
that agriculture reached those regions around the same time as Britain
or Ireland. This may just be a coincidence, because the forested
lowlands of northern Germany, Poland and northern Europe happen to be
poor in metals and would not have attracted Bronze-Age workers from the
Caucasus. North-East Europe also has a fairly modest frequency of R1b,
which further reinforces the correlation between the two haplogroups.«
Rome ET l’Italie (dont le Latium comme cela est visible sur la carte). Il ne s’agit donc pas de sa »banlieue" comme vous dites.