A "single cross" is another name for an F1 hybrid. When two IBLs are crossed the F1 hybrid, or single cross, is the result. This type of cross has the most uniformity and hybrid vigor which makes it the best choice for the home gardener.
A “double cross” is made by crossing two single crosses which come from four separate IBLs. A double cross will be somewhat more variable than a single cross, but will have a wider range of adaptability. This adaptability makes the double cross good for diverse indoor environments.
The “top cross” and the “three way cross” are used as testers. A top cross is an IBL crossed with a variety, and it is used to test for general combining ability.(Ed.note:Only GCA can be found in a topcross.SCA is not sought because one half of the topcross is from a single genotype and the other half is from mixed gametes,therefore,one gene donor is unspecified.) A three way cross is an IBL crossed with an F1. The result of this cross will be one of the parents of the double-cross, and it is used to test for specific combining ability.
A “backcross” is crossing the progeny back to one of its parents,and on another level, to any plant with the same genotype as a Parent. It is designed to improve the parent by retaining most of its qualities and adding a new one. After a series of backcrosses,some degree of uniformity is realized as a result of increased gene frequencies,fixing of some loci through selection and some incidental homozygosity. However, the offspring can only become completely homozygous if the recurrent parent was completely homozygous,and will remain heterozygous for the loci that were heterozygous in the recurrent parent.
A “self cross” is the result of a female Cannabis plant pollinating herself, whether by artificial induction or natural hermaphrodite tendencies. A female that has produced seed from its own pollen is said to be the S0 generation and the resulting seeds are the S1 progeny.
A “full sib” cross is a straight male-female cross between brothers and sisters.
A “half sib” cross uses sister females and unrelated males.
I have a bunch of the old information on breeding strategies from the original site. Not sure if it is already here somewhere but it has all the tags of who posted etc
Maybe I could send to somebody here who would know if it’s already here. Its several pages worth. @GrapeApe @toastyjakes
Yeah this one very misleading. Most of what ppl are crossing are hybrids or polyhybrids.
Ibl is inbreed of the line. Bro on sis taking chosen plants of the same offspring n refining by selecting the ones with favored traits and breeding them.
When you cross a hybrid with unrelated hybrid you create a polyhybrid. Which then inbred 1 gen becomes an h2 hybrid. F1 nowhere in the mix.
Definately would help to get some real by the book breeding info stickied.
Cause everyone quick to jump on f1 f2
My research says i created a p1 polyhybrid. Which is what ppl are calling f1s. When i inbreed it it will be a h2 hybrid no longer polyhybrid. But still not f1
Now I’m really confused. So let’s say I backdrops what is considered a stabilized hybrid. What do I really have? Last year I grew BOGs Sour Boggle, 10 seed germinated and I ended up with 3 female. I picked the best male and crossed it to my favorite female. I thought I had F2 seed but it sounds like in reality I have H1s???
The issue is that f1 should refer to the first generation of seed from a hybrid of two distinct lines. When they refer to a distinct stabile line in botany they are referring to a deeply inbred line that has been stabilized for certain traits. This is so that those traits can be predictably combined when breeding. You need to go to the 9th min 6th generation to start considering something a ibl and that’s only if good breeding and selection was done.
Also I have seen plenty of correct breeding info and procedures posted on this site, just have to look around. Here is one good discussion, but under breeding in the grow fact there is a what is f1 f2 ibl topic also.