Laughter is not genetic.Even though that people have same DNA,they cannot get laughter as a heriditary characteristics.WE cannot consider laughter as a heriditary characteristic cause theres no hormone for laughter.
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the sound of roaring laughter is far more contagious than any cough, sneeze, or sniffle.
DNA is the genetic code
genetic modification can be bad because animals and stuff are changed to taste better but im not sure if that is genetic engineering
for the genetic engenerring to take place it needs genetic code like for a car to drive you need to put gas in it. its simple
I don't think inflammation is genetic.
Short Answer is: our understanding of genetic engineering.