Since I do like to research and educate self for no monetary gain.

I ran across this antique article. Not to be assumed that peeps in 1910 were stupid. I like their views. The article is long and I read thru some if it to get my enjoyment.
My opinion on getting seeds from a fruit/vegetable, from a store produce section.
You may end up with a GOOD fruit and the succeeding fruits from your fruits' seeds. (like was the case with my MOM)
Eventually after years, the fruit changed naturally. Some of her tomatoes started growing oddly shaped, though tasted just fine. Not appealing on a store shelf, but I'm sure a company like Delmonte Corporation or others have no problem using such, since the Ketchup it produces is just GREAT.
So now we get to purchased seeds. There is no GUARANTEE that you
will not end up with MUTTS.

Most seed sellers do want to sell a
GOOD product, since the alternative is (go out of business).
So you grow said seeds and do like your result. You gather those and the next year also like the results. Those results will eventually change. Sometimes for better, and sometimes for worse. That is one way we end up with different varieties. We choose those that we prefer, or are BETTER suited to our needs.
AND IN THE
END, IT IS SO MUCH
FUN THE AMATEUR GARDENER.
Here is link to the article. Interesting but lengthy.
https://en.wikisource.org/wiki/Popu...0/The_Role_of_Hybridization_in_Plant_Breeding
Article explains how selection works. This is a kwik copy/paste from article.
It comes about in this way. Inherited variations are produced by nature with considerable profusion. New characters appear and old characters are lost: these form the working basis of selection.
Of course it also explains the following in humans' evolution.
You do have to at least get a chuckle on the last evolved. This is a Chicken Forum.