6. What percentage of MZ twins had both committed crime? (Darlgard + Kringlen)
- 26%
- 32%
- 18%
- 24%
7. Glueck's study of somatotypes found what percentage of non delinquents were mesomorphs (Sheldon)
- 38%
- 31%
- 35%
- 27%
8. What percentage of adopted children of non criminal mothers had a criminal conviction by the age of 18? (Crowe)
- 9%
- 5%
- 4%
- 2%
9. What percentage of DZ twins had both committed crime? (Darlgard + Kringlen)
- 13%
- 10%
- 21%
- 18%
10. What percentage of sons of non criminal fathers had a criminal conviction? (Osborn + West)
- 13%
- 11%
- 26%
- 15%
