How do they get it so certain fruit has seeds in them and the same fruit does not have seeds in them?

Question

here are some examples watermelon and grapes, you can buy both with or without seeds.

so another question is also what are the different steps taken to make a fruit seedless as opposed to seeded?

Answer 1

With watermelons they are usually a triploid hybrid. They are genetically incompatible ( just enough ) that they cannot produce viable seeds. They do have undeveloped seeds. Not sure about grapes but suspect the same process. I know some plants are the result of a naturally occurring mutation, Navel Oranges for example.

Answer 2

HMM, you know I have actually always wondered that....

Answer 3

The seedless fruits of which you are speaking about are actually hybrid fruits, which for convenience are genetically modified to be made seedless.