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Biological explanations of aggression

A01

Genes

Assumptions made:

1. INFLUENCE aggressive behaviour- Genes cause aggressive behaviour in people e.g. MAOA is
linked to high aggressive behaviour
2. TRANSMITTED from one generation to another- The use of twin studies has shown us that
genes for aggressive behaviour are transmitted and affect…

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Twin studies

Twin studies are used to determine whether genetic influence is greater than environmental
influence. In humans, aggressive behaviour is highly correlated in identical twins, who share 100%
genes, compared to fraternal twins, who share 50% genes.

McGuffin and Gottesman found a concordance rate of 87% in MZ twins…

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