But while most mutations are indeed harmful, some ultimately prove beneficial. (science.howstuffworks.com)
Geneticists still do not know enough about how most mutations in the human genome affect the body to reliably recommend any treatments or other actions based simply on their existence. (scientificamerican.com)
Mutations that initially occur at random may end up seeming to be «directed» in highly nonrandom patterns since most mutations that occur are quickly lost from the population, often in just one generation. (scientificamerican.com)