My understanding is that species delineates “breeding boundary lines” and cultivar are “pushed gene expressions”.
Take freshwater hobby shrimp. You can relatively quickly breed them to express certain colors (cultivar) but without some gene editing you can’t cross breed caridinia and neocaridinia (species).
And if you mix up the pushed color cultivars in a few generations they are very close to “wild type” again.
Take freshwater hobby shrimp. You can relatively quickly breed them to express certain colors (cultivar) but without some gene editing you can’t cross breed caridinia and neocaridinia (species).
And if you mix up the pushed color cultivars in a few generations they are very close to “wild type” again.