Since norms are essential for society, then why do people violate norms? Why people commit crime? There are biological, psychological, and sociological explanations for such behavior. Psychologists and socio-biologists explain deviance by looking for answers within individuals. They assume that something in the makeup of the people leads them to become deviant. They focus on genetic predisposition of individuals toward deviance and crime. In contrast, sociologists look for answers in factors outside the individual. They assume that something in the environment influences people to become deviant. Biological explanation Biological explanations focus on genetic predisposition toward deviance. Biological explanations include the following three theories: 1. Body type: People with squarish, muscular bodies are more likely to commit street crime (mugging, rape, burglary). 2. ‘XYY’ theory. Extra Y chromosome in males leads to crime. 3. Intelligence: low intellige...