not so much “bred out”, although that works as a description.
I prefer “broken linkage” so they no longer both end up in the same plant.
when you perform a cross, you get “random assortment” of characteristics from mom & dad. except when the characteristics are close together on the same chromosome. in which case they will show a biased inheritance pattern
below shows the difference between linked & unlinked. linked means that most of the time there are no recombination events (whole reason for the existence of sex) that will separate the two. so if mom was CBD & cherry, so go her CBD seeds.
“breaking linkage” doesn’t mean moving the gene to a different chromosome, genes don’t move around like that (they do, but that’s another story).
It means swapping the allele mom had for the allele dad had (see homologous recombination)