Biological, Individualistic and Sociological theories Flashcards
What are the Biological theories of crime?
Jacobs XYY theory, Twin studies, Adoption studies, Lombroso, Sheldon.
What are the 3 genetic theories of crime?
Jacobs XYY theory, Twin studies, Adoption studies.
What are the 2 physiological theories of crime?
Lombroso and Sheldon.
What are biological theories?
Focuses on biological theories can make people more likely to commit a crime.
What does Jacobs XYY theory suggest?
Some crime is down to chromosomal abnormality.
What did Jacobs suggest about the XYY abnormality?
That men who have an extra Y chromosome are ‘hyper masculine’ and therefore are more aggressive.
What did Jacobs find in his study?
Men with the XYY chromosome are overrepresented in the prison population with 15 per 1000 within prison.
What are 2 positives of the XYY theory?
There is scientific proof.
Significant number of men in prison had XYY chromosomes instead of normal XY.
How can Jacobs XYY theory be criticised?
XYY men tend to commit non-violent crime. It shows that we cannot categories all crime into one single factor.
Psychological, environmental and social factors can also cause someone to commit crime.
What does dizygotic mean?
Non identical.
What dies monozygotic mean?
Identical.
What does Twin studies suggest?
Twins that are raised in the same environment are equal and controlled. Any greater similarity between identical twins show evidence for a genetic link.
What did the Twin studies test show?
MZ = 10/13 were criminals.
DZ = 2/17 were criminals.
What are 3 criticisms of the Twins study?
Sample size too small - lacks validity.
The study was based on the appearance of the twins rather than their actual genetic material.
It is difficult to separate the influence of genetics from the influence of social factors.
What is a positive for the Twin studies?
Helped in the prevention of specific criminal behaviour.
What does Adoption studies compare and what is the aim?
Behaviour of an adopted chid with the effects of their adopted and biological parents. The aim is to separate out the impact of the environment from the influence of inheritance.
What does research show about Adoption studies?
An adoptee with a biological parent who is a criminal is more likely to take part in property crim than other adoptees and that this effect is stronger for boys.
What are 2 criticisms of Adoption studies?
Age of adoption may mean that children have already been influenced by their biological parents or the environment.
Information from biological parents are inaccurate and sometimes unavailable.
What are 2 positives of Adoption studies?
Easy to separate genetic factors and environmental factors.
There is a correlation between the adoptive children and their biological parents.
Who was Cesare Lombroso?
Italian Criminologist.
1835-1909.
What did Lombroso argue?
Criminals were a throwback to an early stage of human evolution. He said several characteristics were clear signs someone was a criminal.
What 3 features did he say that someone was a criminal?
Large jaws, Extra fingers, Monobrows
What did Lombroso compare?
Compared physical characteristics of Italian prisoners and Italian soldiers and concluded that the prisoners were physically different.
What 3 features did Lombroso find in the Italian Prisoners?
Features such as large hands, long arms and large chins were found.
What did Lombroso think about tattoos?
Markings of a born criminal as they show immortality and insensitivity to physical pain.
What are 2 criticisms of Lombroso’s theory?
Far too simplistic.
There are more factors that causes crime then just genetics, such as wealth, diet, health and other social factors.
What is a positive of Lombroso’s theory?
Lombroso’s work appears to be backed up by Goring (1913) who found lower rates of intelligence in convicts- suggesting they might be less evolved.
Who was William Sheldon?
American psychologist and numismatist.
1898-1977.
What did William Sheldon argue?
Criminal behaviour links to a persons physical form.
What 3 body types did he state?
Endomorphic, Ectomorphic, Mesomorphic.
Define Endomorphic
Fat and soft.
Define Ectomorphic
Thin and fragile.
Define Mesomorphic
Muscular and hard.
What did Sheldon find out?
Mesomorphics are more likely to be convicts.
Ectomorphics are less likely to be convicts.
What does activist mean?
Relating to something ancient or ancestral.
What are 2 disadvantages of Sheldon’s theory?
Body types aren’t fixed throughout lives they can change.
Mesomorphs can be treated differently because of how they look, they might be labelled leading to self-fulfilling prophecy.
What is serotonin?
A Neurotransmitter produced by the brain to influence how impulsive a person is.
What happens when a persons serotonin is reduced?
Negative change in behaviour.
How can serotonin be dominant in our bodies?
Improve mood, decrease irritability in people who are argumentative, produce healthy sleeping patterns and boost overall mood
How can serotonin be criticised?
Not all criminals have low serotonin levels.
Who is Phineas Gage?
American rail-road constructionist.
Born in 1823.
What happened to Phineas Gage?
Survived an accident in which a large iron rod went through his head. It destroyed the left frontal lobe of the brain.
What change in personality did it have on Gage?
Gage became extravagant and anti-social. He started to use bad language, had bad manners and became a liar.
What did Gage’s doctor believe?
The balance between his intellectual faculties and animalistic behaviour was destroyed in the accident.