Scientific Name: Vitis vinifera
Supposed Genetically Engineered Trait: Large size/seedlessness
The Real Story:
Seedless grapes are descended from several different mutations that all result in the developing embryos of grape seeds to abort prematurely*. You can still find the tiny dead remnants of seeds in seedless grapes. Of course being seedless raises a new question: How do plant breeders work with seedless grapes?