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
Autistic Spectrum Behaviours
Biological explanations: Genetic predisposition
- 3 things to know
- Component 3 Applications
Overview
Recall questions on Biological explanations: Genetic predisposition.
What you need to know
Answer each one before you reveal it.
What is the recurrence rate in younger siblings of an autistic child?
Name two single-gene conditions in which autism is common.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What did Folstein and Rutter (1977) find in the first twin study of autism?
Model answer
Concordance was 36% in monozygotic pairs and 0% in dizygotic pairs, the first clear evidence of a substantial genetic contribution.
- 2
What did Bailey et al. (1995) add to the twin evidence?
Model answer
In a larger British sample, monozygotic concordance was about 60% for autism itself and over 90% for a broader spectrum of related difficulties, against much lower dizygotic rates.
- 3
What is the recurrence rate in younger siblings of an autistic child?
Model answer
Around 19% in the prospective study by Ozonoff et al. (2011), far above the population rate.
- 4
Why is autism described as polygenic?
Model answer
Hundreds of common variants of small effect, together with rarer new mutations and copy number variants, contribute to liability; there is no single autism gene.
- 5
Name two single-gene conditions in which autism is common.
Model answer
Fragile X syndrome and tuberous sclerosis.
- 6
What has been reported about paternal age?
Model answer
Older paternal age is associated with a modestly raised likelihood of autism in the child, which is attributed to a greater number of new mutations arising in sperm.
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