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Heritability increases when genetics are contributing more variation or because non-genetic factors are contributing less variation; what matters is the relative contribution. Heritability is specific to a particular population in a particular environment.
The Bell Curve: Intelligence and Class Structure in American Life is a 1994 book by the psychologist Richard J. Herrnstein and the political scientist Charles Murray in which the authors argue that human intelligence is substantially influenced by both inherited and environmental factors and that it is a better predictor of many personal outcomes, including financial income, job performance ...
A study on a large group of children found more than 60% heritability for callous-unemotional traits and that conduct problems among children with these traits had a higher heritability than among children without these traits. [13] [14] The study also found slight sex differences (boys 64%, girls 49%) in the affective-interpersonal factor. [14]
Trait A shows a high sibling correlation, but little heritability (i.e. high shared environmental variance c 2; low heritability h 2). Trait B shows a high heritability since the correlation of trait rises sharply with the degree of genetic similarity. Trait C shows low heritability, but also low correlations generally; this means Trait C has a ...
"Heritability is caused by many genes of small effect." "Phenotypic correlations between psychological traits show significant and substantial genetic mediation." "The heritability of intelligence increases throughout development." "Age-to-age stability is mainly due to genetics." "Most measures of the 'environment' show significant genetic ...
Therefore, a high heritability measure does not imply that a trait is genetic or unchangeable. In addition, environmental factors that affect all group members equally will not be measured by heritability, and the heritability of a trait may also change over time in response to changes in the distribution of genetic and environmental factors. [60]
Studies of human behavior genetics have generally found behavioral traits such as creativity, extroversion, aggressiveness, and IQ have high heritability. The researchers who carry out those studies are careful to point out that heritability does not constrain the influence that environmental or cultural factors may have on those traits. [16] [17]
These two traits may individually have a very high heritability (most of the population-level variation in the trait due to genetic differences, or in simpler terms, genetics contributes significantly to these two traits), however, they may still have a very low genetic correlation if, for instance, these two traits were being controlled by ...