Dr. Shoenmaker, plastic surgeon, discusses how his occupation can alter an individual, but not a species:
[…] Am I altering that grand unbroken chain, no. I am not going against nature, I am not selling out any Jews. Individuals do what they want but the chain goes on, and small forces like me will never prevail against it. All that can is something that will change the germ plasm, nuclear radiation, maybe. They will sell out the Jews, maybe give future generations two noses or no nose, who knows, ha, ha.
–Thomas Pynchon, V.