At the end of the day, if the gene is self-modifying, the meta-code that modifies the gene also lies somewhere within the gene. Or are you talking about externa

At the end of the day, if the gene is self-modifying, the meta-code that modifies the gene also lies somewhere within the gene. Or are you talking about externally modifying a gene by inducing certain mutations? I am no expert, but I have read a couple of good books on the topic and my understanding is that while it is true that your DNA can modify itself to some extent in response to stimulus, the extent to which this happens is very limited in scope, and limited to ancient genetic pathways, which means these get activated only in times of severe biological stress, like through starvation or famine.