Haplogroup R1b is the dominant haplogroup among Irish males, reaching a frequency of almost 80%. R-L21 is the dominant subclade within Ireland, reaching a frequency of 65%. This subclade is also dominant in Scotland, Wales and Brittany and descends from a common ancestor who lived in about 2,500 BC. According to 2009 studies by Bramanti et al. and Malmström et al. on mtDNA, related western European populations appear to be largely from the neolithic and not paleolithic era, as previously thought. There was discontinuity between mesolithic central Europe and modern European populations mainly due to an extremely high frequency of haplogroup U (particularly U5) types in mesolithic central European sites. The existence of an especially strong genetic association between the … Continue reading Are you Irish and Rh-?