Eduqas A-Level Psychology A290QS
Biological Approach
Psychodynamic Approach
Behaviourist Approach
Cognitive Approach
Positive Approach
Comparing the Five Approaches
Core Studies in Social and Developmental Psychology
Planning Psychological Research
Data Handling, Statistics and Mathematical Skills
Evaluating and Validating Research
Personal Investigations and Novel Research Scenarios
Addictive BehavioursAddictive
Autistic Spectrum BehavioursAutistic spectrum
Bullying BehavioursBullying
Criminal BehavioursCriminal
SchizophreniaSchizophrenia
StressStress
Controversies in Psychology
Addictive Behaviours
Biological explanations: Addiction genes and Disease of the brain
- 3 things to know
- Component 3 Applications
Overview
Recall questions on Addiction genes and Disease of the brain.
What you need to know
Answer each one before you reveal it.
Explain the logic that allows a twin study to separate genetic from environmental influence.
Which dopamine receptor gene variant did Blum et al. (1990) report as more frequent in people with severe alcoholism?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What does the addiction-genes explanation claim?
Model answer
That inherited variation in genes affecting neurotransmission, drug metabolism and temperament makes some people far more likely to become addicted than others with the same exposure.
- 2
Roughly what share of the variation in liability to alcohol dependence do twin and adoption studies attribute to genes?
Model answer
About half, according to the meta-analysis by Verhulst, Neale and Kendler (2015).
- 3
Explain the logic that allows a twin study to separate genetic from environmental influence.
Model answer
Monozygotic twins share all their genes while dizygotic twins share about half, so a higher concordance in the identical pairs raised in the same home points to a genetic contribution.
- 4
Which dopamine receptor gene variant did Blum et al. (1990) report as more frequent in people with severe alcoholism?
Model answer
The A1 allele of the DRD2 gene.
- 5
What is reward deficiency syndrome?
Model answer
Blum's proposal that people with fewer D2 dopamine receptors get less pleasure from everyday rewards and so pursue drugs or gambling to lift dopamine to a normal level.
- 6
Explain how the ALDH2 variant common in parts of East Asia protects against alcohol dependence.
Model answer
It slows the breakdown of acetaldehyde, so drinking causes flushing, nausea and palpitations, and that unpleasant reaction discourages heavy drinking.
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