The genetic signatures of Spaniards and Portuguese are providing evidence of the mass conversion of Muslims and Sephardic Jews to Catholicism during the 15th and 16th centuries. Eleven percent were found to have DNA reflecting Moorish ancestors, according to geneticists. The finding bears weight on two different views of Spanish history – that Spanish civilization is Catholic and other influences are foreign, or that Spain has been thoroughly enriched by drawing from all three of its historical cultures, including Catholic, Jewish, and Muslim. The genetic studies were based on examining the Y-chromosome in people, as the Y-chromosome remains unchanged from father to son, detecting similarities in those in the present population with those just after the expulsions of the 15th and 16th centuries.
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