potatoes from tubers that came from seed

remember these little guys i planted thirty-two days ago? last year's potato fruits yielded viable seed which i grew under the lights last winter and these tubers were the product of those plants...i put them in a container on the twentieth of june and as of today three are officially up and running...so...from seed to plant to tuber to plant...nothing new in the plant world no doubt and probably the most elementary of botany exercises..but it's new to me and that's what it's about...i'll be telling the usda too.