Jacobs XYY

Question 1

Describe

Answer 1

• Normally have 23 pairs of chromosomes
• one pair is the sex chromosomes
• having an extra Y chromosome is an abnormality (XYY syndrome)
• people with an extra Y tend to be well built, low intelligence and aggressive tendencies.
• based on studies of imprisoned criminals.

Question 2

Strengths

Answer 2

• It was found that 1 in 1000 inmates had XYY syndrome which proved his theory
• John Wayne Gacey (clown killer) had an extra Y.

Question 3

Weaknesses

Answer 3

• Too much focus on genetics and not on any other factors
• Didn’t explain how some men have this syndrome but do not commit crime.