Grafted lemon and orange tree. AIO

The pic below is a grafted lemon and orange tree in my back yard. This showcases the power of grafting and genetics. You can see lemons and oranges growing from the same tree without issues. Enjoy.

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My Grandfather used to do this all the time. He had an orchard, and one tree had six different kinds of apples. When he moved to Florida he started grafting citrus. Some worked, some didn't. Some of the best oranges I've ever tasted came out of his work.

Not sure that is actually considered genetic engineering.