Hard disagree on apple trees.

Every "Granny Smith" you've ever eaten is fruit from a cloned tree, cloned from the original Granny Smith tree which grew in the 19th century in New South Wales in Australia. This is because the fruit produced by apple trees change with each generation. If you want _that_ apple fruit, you need to clone it (via grafting).

I can therefore see why - if you believe that Newton was inspired by a falling apple - why you'd want that specific fruit to be available and therefore you'd graft a cutting and clone. If you didn't, that apple's taste, look and texture would be lost forever.