Nerd alert
To get an idea of the brave new world plant breeding is likely to be headed now that weed is a mega commercial crop, it’s worth checking out NCBI’s genome sequence data and viewer for cannabis
Basically this process identifies and marks genetic traits on a sequence ‘map’ and allows selection to be done at the level of the individual alleles … and with infinitely more precision than the current methods of ‘that looks pretty good lets suck it and see’. Instead of subjective assessment and observation of the phenotypes, with this approach, specific locations on the plant genome sequence that are responsible for specific traits can be identified, and from these a reference molecular marker map defined. All that the process then involves when a breeder has this information is to test the genome of the plants phenotypes and then use the molecular marker map to identify if the phenotype has the genes in the correct place for the traits you are looking for.
Research paper on the genetic map for Cannabis
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https://genome.cshlp.org/content/29/1/146.full
NCBI’s genome sequence data and viewer for cannabis
https://www.ncbi.nlm.nih.gov/genome?LinkName=nuccore_genome&from_uid=1723451913