What ratios would you end up with pollinating CBD with THC?

[plant]

I guess that depends on which theory you go with.

Two competing theories are supported by existing data:

In one, CBDAS and THCAS are mutually exclusive alleles (i.e., very different isoforms, as the protein sequences are only 84% identical). Genetic analysis supports this model, with approximately 1:2:1 segregation of chemotypes in a cross of drug type versus hemp (de Meijer et al. 2003).

An alternative model is that THCAS and CBDAS are closely linked (i.e., adjacent on a chromosome), and one or the other is inactivated in drug-type or hemp strains. This model was motivated by the discovery of a THCAS -like gene in hemp plants (Kojoma et al. 2006) and is consistent with the possibility that these related genes are derived from an ancient tandem duplication.

U of T researchers publish long-awaited cannabis genome map

The chromosome map now clearly shows that two distinct genes are at play, which should make it possible to separate them during breeding to grow plants without THC.

The gene sequences for the THCA and CBDA synthases are nearly identical, supporting the idea that they come from the same gene that was duplicated millions of years ago. Over time, one or both gene copies became scrambled by invading retroelements, and by evolving separately, they eventually came to produce two different enzymes – CBDA synthase found in hemp (fibre-type), and THCA synthase in drug-type (marijuana).

Evidence from the genome suggests the second theory is correct.

Either way I have kits on the way, I’m sure everyone does different tests. The main trade off is genetic testing ($$$) saves time and space from having to back cross & sibling cross to find traits in their children.