That stuff really needed to be said! I was waiting for someone to talk about the F ones having been a cross of two unrelated strains no one said that on this entire thing and the chart is very helpful thank you.Neither a breeder nor pollen chucker, I'm a humble seed maker, but I dont seem to see a concise answer to the thread...
S1: The first selfed generation.
F1: the first cross between two unrelated parents. The F stands for filial, and refers to the fact that all F1 progeny of the same cross are full brothers and sisters to one another.
F2: the second cross between two of those F1 plants.
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If you took something to F6, and decided it was finished it would become P1
then using it in a new cross you'd go back to the top of the chart again...
say you took it to F4
then hit one it with one of the original parent plants...
hit that with its parent again...
S1 hit with pollen from its parent = S2
Parent hit with S1 pollen = S1BC1 or S1Bx1... I have also seen it written as SB1