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

[anon4675195]

@plant

Is this based on one gene controlling both THCA and CBDA production?

That’s what it looks like with pairing of allele and the co-dominant behaviour you are describing.

THCA and CBDA genes are found on chromosome 6 have been found to be two distinct genes.

In your case above you would be assuming both allele from each gene would be dominant and homogeneous; if each gene carried one dominant and one recessive allele the probability becomes less; if the two alleles for each gene are co-dominant this becomes much more complicated.

To be fair there were two theories, one in 2003 (de Meijer et al. 2003) and one in 2006 (Kojoma et al. 2006). It wasn’t until the genome was recently mapped until they found it was two different chromosomes.

There are two genes that are very closely linked and rarely cross over. For practical purposes you can pretend they are one gene.

They are codominant. If both THCAS and CBDAS are expressed, you get intermediate plants. If you have plants with functional THCAS and CBDAS on the same chromosome, the punnet square I made doesn’t apply. But when starting with a THC dom plant and a CBD dom plant, we know that each parent can only donate a functional THCAS linked with nonfunctional CBDAS, or functional CBDAS linked with nonfunctional THCAS, respectively. Since these rarely cross over, we can treat it as a single locus. To find the rare crossovers, you would need to grow many, many plants, then either perform molecular tests on them or inbreed them and find stable, intermediate lines.