Most of our main food crops have been selectively bred (bread, hehehe). Apples, corn, wheat . . . . According to one source, "The Incas were masters of plant domestication, especially potatoes. Their development of the potato was remarkable: from 8 species of weeds having toxic tubers to more than 3000 distinct potato varieties." Imagine them looking at a poisonous weed and deciding to breed it into taters.