1874[evol-psych] Re: Iq" genetic or environmental?
- Dec 3, 1999On Fri, 3 Dec 1999, Peter Kabai wrote:
> So when discussing what heritability really means,Stated more precisely, the estimate is restricted by the variance
> besides being critical about the methods of measuring the trait, one also
> should keep in mind, that the estimate is restricted to the population in
> which it was measured.
in evironmental conditions affecting the trait inasmuch as genetic
variance between relatives may be assumed to be constant across populations.
Thus, heritabilities are generally reported in terms of a range of estimates.
For example, studies carried out in London, Ontario have found
heritabilities based on co-twin studies in the area of .70 for various
personality traits while the Minnesota studies, based on a much broader
geographical base and hence a wider scope of environments, find estimates
of about .50 for similar traits. It is an intrinsic limitation of the
method but no biggie relative to the intrinsic limitations of most other
behavior science methods - that is, if it is understood and applied
> Heritability of the eye colour is zero in a population of individuals allThis seems pointless - If eyes were all one color then there
> having brown eyes
wouldn't be variance to measure and it would not be a variable.
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