"This is a feature of Turkish ancestry??"
And native American, and Asian. I wouldn't leap to conclusions, unless you're really into ancestry and have started coming across some of the surnames, and have tied them back to TN/NC/VA. They didn't leave much of a paper trail deliberately, these Melungeons, and they often moved quite frequently, which led to the pejorative association with Gypsies. Or, at least that has been my understanding, and I grew up in an area where a number of people who could be so described reside. It's probable that I have some Melungeon ancestry, but it's not an easy thing to prove, just as native American ancestry is not an easy thing to prove.
I live in SE TN, and all my family is from the area as well. I know the history of my paternal grandfather's family quite well, but I know virtually nothing earlier than around 1900 for the rest of the family. My paternal grandfather's family came here in the mid-1800's and were Scot/Irish. The rest of ther family, who knows?
Wouldn't it be amazing, to be able to know that your ancestors were among the first settlers (even before Jamestown) in America?