If you are lucky enough to germinate and nurture a fruit tree seed you cannot be sure what variety it will become.
There are only two ways of ensuring that a variety of fruit can be truly replicated.
One is to take a cutting (called a graft) and plant it in the earth. This will be a true replica of the Apple_tree_graftingvariety but will take quite a long time to grow and become fruitful and will also grow to the normal height of that variety, which generally means a fairly large tree.