Rather, some 4500 years ago almost all Y-DNA heritage from Iberian admixture of Mesolithic hunter-gatherers and Neolithic farmers was replaced by the R1b lineage of Indo-European herders from the steppe, and the Basque genetic distinctiveness is a result of centuries of low population size, genetic drift, and endogamy.
Nanging, kirang langkung  4500 warsa sane lintang  samian tatamian Y-DNA saking pegapukan Iberia  saking  para juru boros Mesolitik miwah petani Neolitik kagentosin olih garis keturunan R1b saking petandu Indo-Eropa saking padang rumput, taleh cirri genetik Basque inggih punika asil saking abad sane alit yaning saihang ring akeh paguyuban, pangingsiran genetic miwah endogamy.