Gene’s survive the same way vitamins do... some get broken down, others make it through the stomach/instestine blood barrier for direct absorption.
Asking your question ...think about how medicine works etc. Why are we influenced by hormones etc.
Why do we take some things orally and other intraveneous? That is where your answer rests.
How interesting about absorption of genes.
Once thru the stomach wall, how are they then carried into the chromosomes and then expressed? Are humans capable of expressing a plant gene? Where would it fit in the chromosome?
We are influenced by drugs or hormones because we have receptors for those molecules, AFAIK. How do the genes get into the chromosomes? I was under the impression that process required a carrier virus. Why would genes from a GMO food enter a chromosome as opposed to one from a *naturally occurring* (albeit manipulated over time) gene present in a grain?
We take various medications by various routes depending on which is most effective or faster &/or where the product is required inside the body in order to work effectively. THAT was my question: my understanding is that genes are ineffective unless inserted into a chromosomes. I do not see the mechanism that would accomplish that through ingestion, especially given a processed product subjected to heat (and some forms of grains are subjected to chemicals, as well) and then digested via stomach acid.
I can understand an allergic reaction to a foreign protein. Genes code for protein formation. I would suspect a reaction to a grain to be allergenic, rather than caused by the inherent genes inside the grain.