reaction+range

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= Definition: = Reaction range- a range established by one's genes, between upper and lower boundaries for traits such as intelligence; one's environment determines where, within those limits, one will be. HGD, Chapter 7, p. 176

= Examples: = Given a specific genetic heritage, a child's actual IQ test performance may vary by as much as 20 or 25 points, depending on the richness or poverty of the environment in which he grows up. When the child's environment is changed for the better, the child moves closer to the upper end of his reaction range. When the environment becomes worse, he falls toward the lower end. Thus, even though intelligence as measured on an IQ test is highly heritable and falls within the reaction range, the absolute IQ score is determined by environment.

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