Seedless watermelon is pollinated by tetraploid watermelon to diploid watermelon to get triploid seeds, which have three chromosome groups. Planting triploid seeds, after flowering, with diploid pollen stimulation, due to three chromosome groups, meiosis association when the disorder, can not form effective male and female gametes, knot triploid seedless watermelon.

So, seedless watermelon generally have no seeds, and can not talk about chromosome groups. The seed coat, pulp and rind are all developed from the tissue cells of the triploid plant, the parent, and are all three chromosome groups.