twin studys Flashcards
what type of theory is twin study’s
genetic
biological
describe dizygotic twins
- born at the same time
- from two separate eggs
- 50% DNA
- non identical
describe monozygotic twins
- born at the same time
- come from one egg
- share 100% DNA
- identical
what is a concordance rate
probability that if one twin has a characteristic the other twin will have the characteristic
what was langes AIM
to investigate the link between genetics and crime
what was langes PROCEDURE
investigated 13 MZ twins and 17 DZ twins for their concordance rate for time spent in prison
what was langes FINDINGS
- 10 of the 13 (77%) MZ twins had both served time in prison
- only 2 of the 17 (12%) DZ twins had both served time in prison
what was langes CONCLUSIONS
if one MZ twins is criminal it is likely that the other will be criminal
what was christiansens AIM
to investigate the link between genetics and crime
what was christiansens PROCEDURE
investigated 3586 twin pairs (male and female) born in denmark between 1881 and 1910 for their concordance rate for criminal behaviour
what was christiansen’s FINDINGS
MALE
MZ: 35%
DZ: 13%
FEMALE
MZ: 21%
DZ:8%
(% = concordance rate)
what where christiansen’s CONCLUSION
identical twins male and female are more likely to commit a crime if the other twin commits a crime - makes are more likely to commit a crime if the other identical twin commits a crime than females
STRENGTH: how can the other study’s be used as a strength
lange and christiansen:
suggest for identical twins offending behaviour is also identical like other factors
STRENGTH:what did ishkawa and raine find, link to GRAVE
higher concordance rate for identical then non identical twins
reliable: repeatable, consistent results
STRENGTH: who are some examples, link to GRVE
kray twins
applicable: useful for explaining real life cases to explain behaviour
