heredity and crime

 

Twin and adoption studies in criminology 
analyze the roles of genetics and environment by comparing individuals with varying degrees of genetic relatedness. Twin studies compare criminal behavior between identical (monozygotic) twins, who share nearly 100% of their genes, and fraternal (dizygotic) twins, who share about 50%. Adoption studies compare the criminal records of adopted individuals with their biological and adoptive parents. Together, these studies suggest that both genetic and environmental factors contribute to criminal behavior, as higher concordance rates for crime are often found in identical twins compared to fraternal twins, and a link is found between biological parents' criminal behavior and their adopted-away children. 
Twin studies
  • Methodology: Researchers compare criminal behavior between identical twins, who are genetically very similar, and fraternal twins, who are less similar.
  • Principle: If identical twins are more likely to have similar criminal behavior than fraternal twins, it suggests a genetic component.
  • Findings: Studies have found higher concordance rates (the percentage of twin pairs where both have committed crimes) in identical twins compared to fraternal twins. For example, one study found a 52% concordance rate for identical twins and 22% for fraternal twins, according to this YouTube video.
  • Limitations: The assumption that both types of twins have equal environments can be false, as twins may share similar social experiences, friends, and perceived identities, which can make it hard to isolate the effect of genetics alone. 
Adoption studies
  • Methodology: Researchers compare the criminal behavior of adopted individuals to that of their biological parents and their adoptive parents.
  • Principle: If an adoptee's criminality is more similar to their biological parents than their adoptive parents, it suggests a genetic influence. If it's more similar to their adoptive parents, it suggests an environmental influence.
  • Findings: Some studies have found a link between the criminal behavior of biological parents and their adopted-away children, particularly for property crimes.
  • Limitations: These studies can be confounded by selective placement, where children are not placed randomly with adoptive families, potentially affecting the results. 
Overall conclusion
  • Both twin and adoption studies provide evidence that criminal behavior is influenced by a combination of genetic and environmental factors.
  • The fact that concordance rates in twin studies are never 100% and that adoption studies show links to both biological and adoptive families highlights the complex interplay between nature and nurture

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