Seedless fruit rarely occurs in nature. This makes sense, of course: Nature is in the business of creating and furthering life. The seedless fruit you will find in the grocery store is the result of a manipulation developed by plant breeders years ago.
Now for some science: Different organisms have differing numbers of copies of genetic material or chromosomes, in their cells. Humans, for example, have two copies of chromosomes in their cells; the genetic term for two chromosome organisms is called diploidic. In nature, there are almost always an even numbers of chromosomes in cells: diploid (2x), tetraploid (4x), hexaploid (6x), etc. This way, when cells reproduce by splitting, each daughter cell receives an equal share of half of the parent cell’s chromosomes. If ploidies were odd, there could be no even split of chromosomes.
Seedless fruit is made by creating an odd-ploidy plant. Seeds cannot be produced from odd-ploidy plants, simply because there’s no way to evenly split the chromosomes. Thus odd-ploidy plants do not generally manufacture seeds at all, and if they are made by the plant, they are entirely nonviable (they themselves will not create seeds for further reproduction of their own genes, and don’t become fully mature seeds. ‘Seedless’ watermelon is an excellent example of this – there are very few seeds in a seedless watermelon and the seeds that are there are small, flimsy, and hollow.
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