Term
| Environment and Genetic Influences diagram |
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Definition
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Term
| Heritability of personality - Minnesota twin studies |
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Definition
- Over 100 twin pairs from all over the world (identical and non identical).
- Some had been raised together, and some had been raised separately
- Large number of individuals who were twins (some triplets involved)
- Some had been raised together, and some had been raised separately
- Over 100 twin pairs from all over the world (identical and non identical).
- Looked at similarities between twins of the proportion of shared DNA and environments
- Found that the environments of the twins who were raised separately tended to be pretty similar which made I difficult to work out differences based on environment
- Study in the 1960s where families generally had a stay at home mum and working dad, or siblings already in the child
- Measured heratibility in a scale from 0 to 1, 1 means completely inheritable while a 0 means that it is not inheritable
- NOTE: Not talking about inheritability at an individual level, but instead at a nation level
- Typically for most of their lives until that point.
- 1 week of testing (Psych & Medical). |
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Term
| Minnesota twin studies - Types of traits that have hereditability aspects to them are factors: |
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Definition
- .23 Warmth
- .36 Excitement seeking
- .5 for work and leisure interests
- .44-.8 for happiness
- Remember - heritability refers to populations, not individuals.
- Heritability estimates are not fixed – changes in environment or in the gene pool can increase or decrease the percentage contribution of either factor |
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Term
| Criticisms of Minnesota Twin Study |
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Definition
- Criticized use of twins because mainly the twins that were separated the environments were quite similar, so couldn’t make a clear conclusion that a factor was inherited through genes or whether it was environmental
- Even identical twins could be treated quiet differently or gravitate towards different types of people
- Children create their own aspect of the environment e.g. temperament influences |
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