Fruit

[Rach4018]

How do they grow seedless fruit?

[Greenbhoy]

From cutting from a donor plant.

Just think, all the seedless grapes in the world all come from the same original group of plants. 

[Kingaroo]

Many seedless fruits are infertile hybrids of fruits with seeds. Cross watermelon A with watermelon B and their baby will not make seeds.

This is just like asking where do mules come from -- their mothers are horses and their fathers are donkeys (or the other way round i forget), and the mules are sterile.

[corganiser]

those seedless mules.............can't get enough of them, yum

[JohnDTC]

you can also ripen fruit while its still growing with ethene gas, which can be done before the seeds have had chance to develop.