Twins - antisocial behaviour

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6 Terms

1

why do we use twins

  • twins can be used to look at correlations between genetic inheritance and behaviour. to get a better look at the nature nurture debate.

  • specifically whether anti social behaviour can be attributed to genetics

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2

Monozygotic Twins (MZ):  

  • Identical Twins

  • exact same DNA; from one fertilized egg

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3

Dizygotic Twins (DZ)

  • Fraternal Twins 

  • similar DNA + same environment

  • formed from two separate fertilized eggs

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4

Grove et al - observation Aim

To investigate the extent to which anti-social behavior can be attributed to genetics

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5

Grove et al - procedure

  • Twin/Adoption Study 

    Sample: 

  • 32 sets of monozygotic (MZ) twins who were separated at birth - these were further adopted into different families​.

  • method: Interviews, tests, and questionnaires.

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6

Grove et al - results

  • Heritability of anti-social behaviour: in Adults: 28% in Children: 41%

  • The study found a substantial genetic component to antisocial behavior, with a correlation of 0.41 for childhood conduct disorders and 0.28 for adult antisocial behaviors among monozygotic twins

  • There is evidence that suggest that as people get older the environment might be more of a factor than genetics itself.

 

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