If you ate a Macintosh apple and planted the seed, the tree that grew would produce apples that didn't look or taste like Macintoshes. Instead of planting seeds, growers graft a cutting from a genetically desirable tree onto an existing branch or sapling (called the "rootstock"), resulting in apples that are genetically identical to those on the tree from which it was cut. If you look closely at the tree in the photo, you can see that there are several different types of apples on the various branches, all of which are grafted onto the same rootstock tree.