Genetic Similarity - Raine & Baker SAQ

Aim of R&B

to investigate the heritability of antisocial behaviour in twins

Method of R&B

• twin study methodolgy

• sample was 1210 twins in california

• data was gathered using questionnaires

• questionnaire designed to measure child’s level of antisocial behaviour through their personalities, behaviours, and social skills

Data triangulation

The use of three people to fill out the questionnaires: Parents, Teachers, Participant

Antisocial behaviour

• Actions like bullying, cruelty, stealing, or skipping school

• good predictor of later criminal activity

Twin study design

compares similarities between identical twins (100% DNA shared) and fraternal twins (50% DNA shared)

Genetic similarity

How much genetic material individuals share

• identical twins - 100%

• Fraternal twins - 50%

Importance of Genetic Similarity study

valuable source of data for genetics research

Results of R&B

the results showed that heritability of antisocial behaviour was around 50% meaning if one twin showed antisocial behaviour, then there is a 50% chance the other twin will display antisocial behaviour

Conclusion

In conclusion, antisocial behaviour is 50% heritable and half explained by environmental factors.