Just keep in mind that Dominicans evolved from a very small founder population. Very few Dominicans are entirely of recent foreign origin. Most are either direct of colonial stock or mixed colonial origins with recent migrants. That's why certain things like Taino DNA is so widespread and includes all types of looking Dominicans whether they have a feature or two that reminds of the indians are no indian feature at all. If there is Taino DNA, there will also be DNA of the Spaniah settlers/conquistadors in the very beginning and DNA from the first Africans that essentially were crossed the Atlantic Ocean. On top of that are origins of much more recent times inclusing those of Spaniards and Africans and others that arrived in the later century.
With a small founder population comes other things such as from the beginning an elevated habit of cousin marriages. Think about it. When you hear things like at a certain point there were around 6,000 people in the entire colony. Today any barrio in Santo Domingo has more than 6,000 and yet, that's how many were in the entire colony at one point. That includes the babies and kids, the elderly, the handicapped, the deforms, the entire population. Plus, this population was scattered, it wasn't overwhelmingly concentrated in lets say Santo Domingo. Most people spent their entire lives within a radius of perhaps 15 km. It goes without saying that most people mated with people they already knew perhaps since childhood, literally close cousins. This is also part of the reason why with most Dominicans, you start to figure out their family tree and eventually all these people that don't know each other have the same ancestors. A large segment of Dominicans are related to each other at a certain level. This is not the "all of humanity evolved from Africa" because to find a common ancestor you have to go back more years, perhaps thousands of years before Columbus arrived in 1492. This is more of finding common ancestors a mere 3 or 4 generations ago.
Given the very smsll founder population, there will be certain genetic diseases that for some reason stuck with this population more than others and vice versa. It could be the case of Dominican men having a higher than normal prostate problems. It could also be the reason for some other stuff that is more common among Dominicans, auch as a type of balding which is aggressive and has no real pattern as it's diffused. Notice there are many Dominican men, young and old, that are losing their hair this way while it isn't common to see in many other populations.
