that’s great. You will get good consistency in the first gen of your cross that way. There will probably still be some varying degrees of each parent, since nothing is fully homozygous. But at least you won’t be looking at a completely different plant for every seed you grow. If the cross is helpful to you, then you will be able to stop there and enjoy its benefits.
As for the effects, there is really no way to predict what will come out. For example, ‘giggles’ isn’t a biological trait, so much as how your body chemistry responds to a certain cannabinoid or profile of cannabinoids. It’s probably related to several cannabinoids, which are each linked to several biological traits.
I don’t think anybody in the entire industry can tell you either what exactly cannabinoids/profile will have that effect on you for certain – or predict a priori what cannabinoid profile will come out of a single cross. Much of breeding still depends on testing crosses and observation of outcomes, rather than using any for of genetic prediction.
For certain simple traits that are well understood, it is possible to have a good idea of the outcomes. If you cross a photo and and auto, the first generation will probably be photo – but even that assumes that the photo parent is homozygous, which is usually true, but is not known to be true until tested by crossing with the homozygous recessive auto.
Furthermore, if you are trying to stabilize multiple recessive traits, you must first know that they are recessive, you must also know that they are linked to single alleles and you must either attempt to do it in steps, or use high numbers. And in either case, it is not done in a single generation of cross.
For example, if you have a recessive color gene in one parent and a recessive auto gene in the other parent, your first generation cross will probably not have either the color or the auto. Then you inbreed 1 generation to F2. In that generation, 25% will have the color, 25% will have the auto, but only 25% of 25% of plants (1/16th) will have both the color and the auto. In numbers, you will need to grow 16 males AND 16 females to stabilize 2 recessive traits in a single generation. Alternatively, you can strategize an open pollination with a female that expresses only 1 of the traits, and then use better odds in the F3 generation.
On the other hand, with cannabinoids, since there’s probably a high number of genes involved, it becomes more statistical than deterministic, with the median plant being somewhere in the middle of the two parents, and tails of outliers more extreme than either parent – especially with longer tails in the first inbred generation (F2).