According to the text, people who have low MAOA gene expression tend to:. 1. demonstrate high levels of implicit prejudice 2. more aggression when provoked. 3. low levels of subtle prejudice. 4. tend to behave in a less aggressive manner.

2). More aggression when provoked.

Explanation:

MAOA gene is described as the enzyme that involves the gene of two neighboring family members encodes various enzymes which circulate the oxidative deamination of distinct amines like serotonin, dopamine, etc. The alteration in the presence of such genes results in the occurrence of genetic disorders like Brunner syndrome or various mental disorders.

As per the question, the people having low MAOA gene expression are likely to show 'more aggression when provoked' as it prevents the appropriate functioning of the brain and 'catalyzing of oxidative deamination of distinct amines' that leads them to show such aggressive behavior. Therefore, option 2 is the correct answer.

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