Q.germination of seedless watermelon
I bought a seedless watermelon from the store and noticed that it had one black seed in it. I planted it in a pot and it germinated. The plant has now produced a small watermelon. I thought that seedless watermelons were sterile.
Since seedless watermelon is a hybrid the seeds that will show up in the fruit will not grow a seedless watermelon, but some form of the fruit used to create the hybrid.
Here is a link that will give you more information.