Yes, in theory, you can grow apple trees from seed. The apples you buy from the farmers' market or the grocery store have seeds and, if planted, they can sprout and grow an apple tree.

Apple trees are hugely popular, and thousands of apple cultivars exist worldwide. Most apple trees planted nowadays are grafted, but you can grow an apple tree from seed if you so desire.

Apples don’t sprout “true to type” from seed, so fruit from Chapman’s trees was mostly bitter, useful only for making hard cider, which could be distilled into applejack.

Growing apple trees from seed isn't hard, but it is an exercise in patience.