There are some serious books out there on breeding and goes very deep my friend had one cannot remember the name of it but it's was some hardcore botany to read up on...I'm sure s2 is even more guranteed stable seeing how they do it looked very long and time consuming but the end result worth it. Below is an extract I found explainging things in simple terms, once you start reading up it really can go over your head so you need to be really into it love your botany and love to be a perfectionist.
Otherwise it really fries your brain lol
<snip>
The process employs father plants which are selected from long
line-bred farmlines or
IBL’s (
Inbred Lines) that are known to be dominant for a specific trait, I.E light sensitivity, potency, fast flowering etc. These father lines are outcrossed to self pollinated
elite cuts selected from
stress tested poly-hybrid mothers which have been selected for other qualities such as exotic flavors, smells, or specific plant shapes or structures. As the original
mother cuts are not true breeding because of their polyhybrid nature they take them though a 2 time
self pollination process(s2) to obtain homogeneity, heavily stress testing a selection before they ever meet the pollen studs. For those who do not understand the “
selfing” process it means a female plant is chemically sex reversed allowing it to pollinate itself resulting in
s1 seed generation-One common misconception is that this process will result in identical phenos exactly like their
mother plant -however in reality
recessive traits can still be hiding with variation occurring among sibling seeds so this process must be repeated with the adequate s1 seed to achieve more homogeneous
s2 seeds. Stress tested s2’s of excellent mothers are breeding gold as they are homozygous for all traits seen in the s1 individual selection.
<snip>
Probably best to start up another thread on Breeding so we don't clog up this one as it goes on forever
.