Gene map of tomato (Solanum) (2n = 24)
Tomatoes occur in the wild in South America, and their fruits have been bred in many different decorative varietal forms, the cultivation and production of which are commercially valuable. As in Garden Peas, the gene loci responsible for these traits have been mapped to chromosomes.

A major consideration in commercial varieties bred for ketchup, sauces, and pastes is solids content: increase of 1% solids is worth multiple millions of dollars every year. Experimental crossbreeding of wild relatives to conventional stocks is an active area of research.

Figure 2002 by Griffiths et al.; all text material 2016 by Steven M. Carr