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Study linked below says that both Pre-Roman Celts and Early Anglo-Saxon immigrants had less of Southern European ancestry than modern English, which means that modern English are not just a Celtic-Germanic mix but that some other admixture is pulling them genetically towards the South:
http://biorxiv.org/content/biorxiv/e...55855.full.pdf
Excerpt:
In other words, both Iron Age Celts and Anglo-Saxon immigrants were more Northern genetically than are modern English.We analyzed a variety of samples from Celtic (Scotland and Wales) and Anglo-Saxon (southern and eastern England) populations from modern Britain in conjunction with the PoBI samples and ancient Saxon samples from eastern England24 in order to assess the relative amounts of Steppe ancestry. We computed statistics27 of the form, where Steppe and Neolithic Farmer populations are from ref. 21,22 , Pop1 is either a modern Celtic or ancient Saxon population and Pop2 is a modern Anglo-Saxon population (Table 2, Supplementary Table 2). This statistic is sensitive to Steppe ancestry with positive values indicating more Steppe ancestry in Pop1 than Pop2. We consistently obtained significantly positive statistics, implying that both the modern Celtic samples and the ancient Saxon samples have more Steppe ancestry than the modern Anglo-Saxon [they mean: English] samples from southern and eastern England. This indicates that southern and eastern England is not exclusively a genetic mix of Celts and Saxons. There are a variety of possible explanations, but one is that the present genetic structure of Britain, while subtle, is quite old, and that southern England in Roman times already had less Steppe ancestry than Wales and Scotland.
This is also obvious if you compare them in any of Gedmatch calculators, for example Eurogenes K15:
http://eurogenes.blogspot.com/2014/1...s-roundup.html
1) Hinxton Iron Age Celtic Briton - 38% North Sea / 30% Atlantic / 6.5% Mediterranean
2) Hinxton Early Anglo-Saxon - 41.5% North Sea / 28.5% Atlantic / 6.5% Mediterranean
3) Modern Englishman from Kent - 35.5% North Sea / 30% Atlantic / 11.5% Mediterranean
Modern Englishman scores almost two times more of Mediterranean than both Pre-Roman Celt and Anglo-Saxon immigrant.
Also North Sea admixture is lower in modern English from southern England than in both Celts and original Anglo-Saxons.
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This Southern admixture must be either from Roman times or from Post-Anglo-Saxon (e.g. Norman and later) times.
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