Originally Posted by
alanmerciecaHere is a good answer to your question, and there is proof that this is true, a university hortacologist has said so, I forget which hortacologist, yet she said that before pollination was used to change dna, grafting was used. What this person left out, it that if something is half way between the exact same, and totally different it can change the variety in a good way. Each plant variety, has at least somewhat different grafting requirements, so that could complicate the grafting success
http://bulbnrose.x10.mx/Heredity/GraftHybrids/Hamilton1899.html