Description
Haplogroup I is the oldest major Y-DNA haplogroup in Europe, predating both Neolithic farmers (who arrived from Anatolia ~9,000 years ago) and Bronze Age steppe migrants (who arrived ~4,500 years ago). It was likely the dominant haplogroup among European Mesolithic hunter-gatherers and survived the successive population turnovers that reshaped European ancestry. The two main branches diverged dramatically in their distributions: I1 became the signature haplogroup of Scandinavia and Northern Europe, while I2 dominates in Southeastern Europe, particularly in the Balkans. Both branches preserve ancient pre-Neolithic European paternal lineages.
Interesting Fact
Ancient DNA recovered from European hunter-gatherers dating back 37,000 years has revealed haplogroup I lineages, making it the most ancient known continuous European paternal lineage — predating the invention of agriculture in Europe by over 30,000 years.
Distribution by Ethnicity
| Ethnic distribution | Region | Frequency | Sample |
|---|---|---|---|
| Bosniaks | Southeastern Europe | — | |
| Croats | Southeastern Europe | — | |
| Swedes | Northern Europe | — | |
| Serbs | Southeastern Europe | — | |
| Danes | Northern Europe | — | |
| Norwegians | Northern Europe | — | |
| Finns | Northern Europe | — | |
| English | Western Europe | — |
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References
- Fu et al. (2016) — The genetic history of Ice Age Europe. Nature 534, 200–205.
- Rootsi et al. (2004) — Phylogeography of Y-chromosome haplogroup I reveals distinct domains of prehistoric gene flow in Europe. American Journal of Human Genetics 75(1), 128–137.
- Olalde et al. (2019) — The genomic history of the Iberian Peninsula over the past 8000 years. Science 363(6432), 1230–1234.