Genetically, in terms of Y-chromosomes and Mt-DNA, inhabitants of Britain and Ireland are closely related to the Basques,[27] [28] reflecting their common origin in this refugial area. Basques, along with Irish, show the highest frequency of the Y-chromosome DNA haplogroup R1b in Western Europe; some 98% of native Basque men have this haplogroup. The rest is mainly I and a minimal presence of E3b.The Y-chromosome and MtDNA relationship between Basques and people of Ireland and Wales is of equal ratios as to neighbouring areas of Spain, where similar ethnically "Spanish" people now live in close proximity to the Basques, although this genetic relationship is also very strong among Basques and other Spaniards. In fact, as Stephen Oppenheimer has stated in The Origins of the British (2006), although Basques have been more isolated than other Iberians, they are a population representative of south western Europe. As to the genetic relationship among Basques, Iberians and Britons, he also states (pages 375 and 378):
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