And, contrary to erroneous interpretations of the heritability index, as societies become more egalitarian everyone has more similar experiences the heritability index goes up as environments become more similar, variability between individuals is due more to genetic factors. Some have pointed out that environmental inputs affect the expression of genes  see the article on epigenetics. Similarly, multivariate genetic analysis has found that genes that affect scholastic achievement completely overlap with the genes that affect cognitive ability.
Similarly, multivariate genetic analysis has found that genes that affect scholastic achievement completely overlap with the genes that affect cognitive ability. Using kinematic analysis, the results of the experiment were that the twin foetuses would interact with each other for longer periods and more often as the pregnancies went on. Please help improve this section or discuss this issue on the talk page.
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One should also take into account the fact that the variables of heritability and environmentality are not precise and vary within a chosen population and across cultures. These results suggest that "nurture" may not be the predominant factor in "environment".
This observed behavior cannot be contributed to any current form of socialization or social construction. Beyond that minimum, however, the role of family experience is in serious dispute.
The term has thus moved away from its original connotation of "cultural influences" to include all effects of the environment, including; indeed, a substantial source of environmental input to human nature may arise from stochastic variations in prenatal development and is thus in no sense of the term "cultural".
When fraternal twins are reared apart, they show the same similarities in behavior and response as if they have been reared together.
But even for intermediate heritabilities, a trait is always shaped by both genetic dispositions and the environments in which people develop, merely with greater and lesser plasticities associated with these heritability measures. Most adoption studies indicate that by adulthood the personalities of adopted siblings are little or no more similar than random pairs of strangers.