A recent study conducted in Puerto Rico suggests that over 61% of the population possess Amerindian mtDNA. Juan Carlos Martinez, a biology professor at the University of Puerto Rico who conducted his own mtDNA studies, says, "Our results suggest that our genetic inheritance of indigenous origin can't be very low and could be even higher than the inheritance from the other two races (Caucasoid and Negroid)." On average Puerto Ricans possess approximately 10-15% Native American DNA, most of it Taino in origin; it is mixed into the genome in short pieces, consistent with a single short period of union between the races several hundred years ago.
? Martínez Cruzado, Juan C.
The Use of Mitochondrial DNA to Discover Pre-Columbian Migrations to the Caribbean:Results for Puerto Rico and Expectations for the Dominican Republic.Kacike: The Journal of Caribbean Amerindian History and Anthropology