The transfer of genetic expression across a graft barrier is proven to happen but only as a result of RNA translocated across the graft.
The most recent proven example of something similar to this was in a mouse that contained a gene for black body with a white tail. Specific crosses with pure black mice resulted in a genotype that should have had a black tail but that in fact expressed the white tail character.
The problem with graft induced trait modification is that it would not normally be heritable over a succession of generations.
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