6.1.1 - XYY Personality Flashcards

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1
Q

What is XYY?

A

Random mutation causes extra Y chromosome on sex pair.
No cure, can be helped by intervention.
1/1000 population, 15/1000 in prison population. - Jacobs et al

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2
Q

Characteristics

A
  • Flat feet
  • Belly fat
  • Acne
  • Tall
  • Behavioural
    difficulties
  • Lower iq (normal range)
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3
Q

Thielgaard

A

Supporting.
Studied blood samples of over 30,000 men, XYY have lower levels of intelligence and more aggression compared to normal men.

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4
Q

Gotz et al

A

Supporting.
34,000 infants scanned, compared XYY with controls, higher rate of crime and anti social behaviour.

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5
Q

Holin

A

Opposing.
No significant correlation between XYY and aggression.

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6
Q

Correlational

A

Weakness.
No cause and effect.

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7
Q

Other factors

A

Deterministic - scapegoat.
Can’t explain female criminality.

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8
Q

AO1

A
  • A mutation on the 23rd pair producing XYY instead of the common XY
  • It is seen in 1/1000 male births however 15/1000 in the prison population (Jacob’s)
  • Tendency of crime
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9
Q

Strength

A

Gotz et al
- Screened 34,000 infants to compare XYY with controls
- Significantly higher frequency of anti social behaviour and rate of criminal convictions (against property usually not people)

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10
Q

AO1

A
  • Hard to determine who has XYY
  • Around 75% of men with XYY go undetected
  • Can’t be cured however it is vital to diagnose early to reduce symptoms by therapy such as speech or educational therapy
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11
Q

AO1

A
  • May lead to behavioural symptoms
  • Impulsivity, explosive temper, ADHD
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12
Q

AO1

A
  • Phenotypic characteristics such as tall, acne and flat feet
  • May feel different and insecure
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