According to Jim Fallon, professor of neuroscience at the University of California, the genetic basis of serial killers is different from the rest of the population, even though there is a pattern among them. Something that has to be taken on count is that one of the main violent genes, such as the MAO-A gene (also known as the warrior gene) are found in variants within the average population. Some people have it, because it is sex-linked and considering that is located on an X chromosome, it can only be obtained from the mother.
This is perhaps one of the reasons why there are more male-to-female serial killers, because the daughters receive an X chromosome from the mother and one from the father, so this gene is diluted. On the other hand,
This is perhaps one of the reasons why there are more male-to-female serial killers, because the daughters receive an X chromosome from the mother and one from the father, so this gene is diluted. On the other hand,