A person does not need to have acquired a doctorate in psychology to determine that there is something horribly different about serial killers. Quotes from killers show this drastic difference, such as Ted Bundy who said, "What's one less person on the face of the earth anyway?" (Scott 2). Or Charles Manson who, with seven simple words, disgusted and inspired millions by saying, “Death is the greatest form of love” (“Charles Manson”). It is within these people that it is easy to determine how unstable the very fabrics of their genetic and brain codes are; many things can be passed on genetically from a parent to their offspring through heredity; therefore, the biological need to become a killer may also be one. The opposition between nurture and nature is a long-standing debate. Nature, also known as pro-heredity in this essay, concerns the relationship between a person's genetic predispositions and their behavior and intentions. The monoamine oxidase A (MAO-A) gene has earned the nickname "warrior gene" because it has been associated with aggression in observational and survey-based studies (Johnson and Tingley). In a real-life study, a man named Jim Fallon, who has been studying the biological basis of behavior for nearly 20 years, discovered that he had a particular variant, MAO-A, which diminishes the calming effects of serotonin . Not only did Fallon discover this, but he also discovered that "one of his direct great-grandfathers...was hanged for the murder of his mother." This line… produced seven other murderers… Lizzy Borden… “Cousin Lizzy”… was accused… of killing her father and stepmother with an axe…” (Hagerty). This is surely due to the fact that this compulsion to kill has been inherited in family lines. Some signs also appear in the brain, such as in brain scans...... middle of paper ...... side The Brain of a Psychopath: The Sentencing Debate." NPR. npr, June 30, 2010. Web . March 26, 2014.. Monk, Richard. Taking sides: Controversial views on crime and criminology. Guilford, Connecticut: Dushkin Publishing Group / Brown & Benchmark. . Pemment, Jack. “What Would We Find Wrong in a Serial Killer's Brain?” Psychology Today, April 5, 2013. Web. brain-serial-killer>.Scott, Shirley "What Makes Serial Killers Work?." Turner March 26.2014. .