1854[evol-psych] Re: Iq" genetic or environmental?
- Dec 2, 1999
>I know of no quantitative genetic model that would say
> I suspect many people are upset at having to multiply for IQ
> i.e. Iq = G*E
> and find that something seems to be missing. Of course, it is
> Can simple multiplication be the best model for something so
> when it does not suffice even for freshman physics which
> point masses, acceleration along straight lines, massless springs
> of nonvolitional dead bodies?
IQ=G*E. The standard model is additive:
where P is the phenotype (IQ in this case) , A is the
Additive genetic effect, and D the non-additive effect (ie
dominance); E is the effect of the environment. G*E is not
a multiplicative function, but a statistical inteaction, as
are gene x gene interactions (I).
These terms are all pretty meaningless when applied to
individuals, but are easily interpreted as VARIANCES (when
poplation diffrences in these terms can be determined).
If you have suitable data (difficult to get for humans and
IQ, but easy for plants and other phenotypes) you can get
estimates of all these terms and show that this additive
model of gene action is pretty good.
Why should IQ be any difefrent to any other character in
humans, animals or plants?
>This contingent type model will come out in G*E term of the
> I think they want a more complex mathematical model which is
> better at
> taking into account much of the evidence from real life. For
> they might want an equation that does something like "if the
> disposition is low...etc etc."
Professor of Evolutionary Genetics
Director of Postgraduate Studies
Department of Biological Sciences
University of Exeter
Prince of Wales Rd
Exeter EX4 4PS
Tel: 44 (0) 1392 263791
Fax: 44 (0) 1392 263700
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