Up-to-date evidence showing that Italians have remained the same since ancient times, and not mixed with Africans, Arabs or other non-Europeans, and that they're genetically and phenotypically Caucasoid and Southern European from North to South.
Badly designed studies have overestimated African admixture in Italy, but based on a large set of DNA markers, Italians have less African admixture (orange) than Northern Europeans have Asian admixture (pink).
The Moors were Arab-Berber Caucasoids, not black as is often claimed, and Italians only have a small amount of recent Middle East/North African admixture, because the Moors were expelled from Italy.
Italians cluster with other Europeans, not with Arabs or Africans, because the Mediterranean Sea has been a strong genetic barrier (thick red lines) since ancient times.
North-South genetic distance in Italy is about the same as in Germany, and is a product of geographic distance and the clinal distribution of Mesolithic hunter and Neolithic farmer ancestry in Europe.
Based on the distribution of nonmetric cranial traits, Italians (highlighted) plot in the center of a European cluster (red) that also includes Caucasoid North Africans but is far from Sub-Saharan Africans (green).
Despite some bizarre claims of big differences between North and South, very similar racial types predominate throughout Italy, and none are Nordic or particularly light or dark.