The MAOA gene is associated with which behavioral tendency?

• A. Aggression
• B. Digestive enzymes
• C. Sleep patterns
• D. Visual acuity

Answer: (A)

Aggression is the behavior most linked to the MAOA gene. This gene codes for the enzyme monoamine oxidase A, which breaks down neurotransmitters such as serotonin, norepinephrine, and dopamine in the brain. Variants of MAOA influence how active this enzyme is. The low-activity variant leaves these neurotransmitters at higher levels, which can affect impulse control and emotional regulation, especially when combined with adverse childhood experiences. That combination has been repeatedly associated with greater aggression in psychology research. The other options don’t relate to the MAOA enzyme’s role—digestive enzymes, sleep patterns, and visual acuity are not the behavioral tendencies tied to this gene.