Term
| Environment and Genetic influences |
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Definition
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Term
| Intelligence and heredity |
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Definition
- Probably fair to say that few individuals today would argue that IQ is entirely determined by genetic makeup.
- Just as with evidence for heredity, there is considerable evidence for environmental influences
- Similar as children, and when they reach adulthood they tend to become more different. In childhood they had very similar environments, but in adulthood there is a great difference in environment
- An adopted child as a chid has a very similar IQ to their siblings, but as they grow up they begin to have an IQ similar to their actual biological parent |
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Term
| Intelligence and environment |
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Definition
o Correlation between IQ of non-identical twins higher than that between siblings
o Evidence that enrichment of environment is associated with increase in IQ
o IQ scores worldwide appear to be increasing (“Flynn effect”), while genotype remains essentially the same. People are performing higher on IQ testing |
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Term
| Genetic and environmental interaction |
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Definition
- Notion of “heritability”, that percentage of population variability that can be accounted for by differences in people’s genetics – estimates for IQ generally between about 0.4 and 0.7
- Very important to remember that heritability refers to populations, not individuals – it doesn’t mean that your IQ is between 40% and 70% genetically determined! |
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