Mark Macnair wrote:

> I know of no quantitative genetic model that would say

> IQ=G*E.

Great. I know that too. Isn't that a shame?

The standard model is additive:

> P=A+D+E+G*E+I etc

Yes, that is also the model seen in the literature. That

is also shameful.

> 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).

I guess explanation of why it has to be multiplicative is

not sufficient. Perhaps someone can explain why it has to

be additive.

Or is the reasoning like this: it is additive because X

did it this way N years ago and we have all been following

in his footsteps because we don't see why it should be

additive or multiplicative, and we don't use probability

theory or logic (crisp or logic).

--

M. Hubey

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