I want to know the answer to the following question:
How many varieties of seedless grapes are there?
All the background I'm provided with is that "There are several sources of the seedlessness trait, and essentially all commercial cultivators get it from one of three sources: Thompson Seedless, Russian Seedless, and Black Monukka, all being cultivars of Vitis vinifera.". Is that enough to answer the question?
Answer: no