What's the general idea of reverse breeding?
Hang on to the parent seeds?
Then cross the seed with new introduced parents, of the same geographic origin?
Making sure you keep the OG parent seeds as a backup. So we can revert if need be?
All the F's have always been confusing to me.
Aren't the seeds just like animal breeding in a way?
You can't inbreed very far. Or defects and anomalies start popping up all over the place?
This is what newbie breeders fear about inbreeding. Fear that if they go beyond F1 they gonna lose heterosis (or fire if you will) and all manners of weakness will manifest.
If you have no idea what you are doing then all the above fear is true this is why education in proper breeding technique is important. Breeding is more than just pollinating a female flower.
There are techniques in inbreeding that avoid/minimize the close relative breeding. One example of this, is...never breed brother and sister, it's a big no no. Breeding is a science and an art by itself.
Take the case of Game Fowl Breeders, not so popular group due to the nature of the animal they breed (for cockfighting or used to be). Game fowl breeding started since the early history(Aztec, pre-roman Britain, etc) yet to this day, breed line are as pure as they can be and as vigorously vicious as they used to be if not more. Makes you wonder how they can maintain such pure breed. Modern breeding whether for crop or livestock have adopted these techniques from the game fowl breeders.
The F's explain the generation of the same bloodline without outcrossing, the moment you cross such bloodline to a different strain or even unrelated same strain, you start again from F1
F1 = cross of 2 unrelated strain
F2 = offspring of F1 cross with either of the following Father/Mother/Uncle/Aunt/Cousins
F3 = offspring of F2 cross with either of the above or Grandparents
F4... F5... so on
When you hit F6 and have done due diligence in selecting, culling, and pairing...you pretty much have a new breed/strain. the genetics at this point is pretty much stable and it would be a rare instance when a different pheno would express itself. This process is called Linebreeding or Inbreeding.
As a "breeder" it is your duty to maintain the purity of this bloodline otherwise the moment you cross this out this bloodline is gone. So you continue your F's F7, F8 and so on and on. We don't see this in cannabis, everything in cannabis is F1