Recent studies found tat in some parts of Spain and Pirtugal as many as 20% of men carry the Cohen gene on the Y chromosome, which as been identified as an inicator of Jewish descent. In this case, it shows the significant number of Sephardic Jews who converted to Catholicism up o and including 1492. Indeed, historical records show that many conversos volunteered to go to New Spain to escape the Inquisition. So we can expect that many people of mixed Indian and Spanish ancestry in Mexico and Central America would have the Cohen gene as well. To the extent it shows up, it can attributed to the Spanish conversos and crypto-Jews. But how many of them might be an inheritance from a much more ancient Jewish ancestor? You can never tell.