Another question is bread for Mass, since modern bread is mostly genetically modified.
Ditto. Does bread made with genetically modified wheat, retain the appearance and accidents of what is commonly considered to be wheat bread? I have to think so. Besides, "genetic modification" also takes place in nature, as new strains of grains, plants, and so on, emerge due to natural selection. (To speak of "natural selection" doesn't presuppose godless evolution. The propagation of animal species can change due to environmental factors, e.g., various animals who have physical traits of appearance that enable them better to camouflage themselves from predators, or stronger animals who can defend themselves against these same predators. "Survival of the fittest" is readily observable in nature.)