I wonder why growing traditions between apples and bananas are so different. Not to mention citrus fruit. All the citrus fruit we buy in stores comes from grafted trees. Farmers who grow apples and citrus graft branches onto immature trees so that they'll grow up to produce the variety of fruit the farmer wants. If you plant seeds from those fruits, you'll get something completely different, at random, in a process analogous to how children are different from their parents.

I don't know how bananas are grown, but I wonder why we have such a variety of citrus and apples, but not a variety of bananas.