Biological theories jacobs XYY

Question 1

What is Jacobs XYY theory

Answer 1

men with an extra chromosome are more likely to commit/ be involved with crime

Question 2

What type of disorder is the XYY syndrome

Answer 2

Genetic

Question 3

What are some characteristics of XYY

Answer 3

Long limbs
Acne
Lower IQ
Agressive behavior
Tall
Increase level in testosterone

Question 4

How does XYY happen

Answer 4

Abnormalities which occur during fertilization
This means its not inheritable

Question 5

What did Patricia Jacobs do

Answer 5

Examined 197 scottish prisoners for chrosonal abnormalities
Foubd that XYY men are over represented in prisons
Every 1000 prisoners 15 have XYY

Question 6

Strengths of XYY

Answer 6

Theory has been backed up by modern research increasing the reliability of

Standardised and objective measurement increases reliability the theory more trust worthy

Real life application- if it can be found earlier then issues can be addressed early this helps to crime

Question 7

Weakness Jacobs XYY

Answer 7

Cause and effect is not clear as subjects were receiving other medication decreasing the validity of the study

Ignored effect of other variables like environment

Not very representative so hard to generalize