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Jack comments on Undiscriminating Skepticism - Less Wrong
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It is not evidence for that at all; an alternative explanation for the difference is that a child's intelligence depends to a significant degree on the prenatal environment, which is determined by the mother's genetics exclusively. I predict that the extra degree of correlation between a mother's and child's intelligence over the correlation between a father's and child's intelligence will be very close to equal to the degree of correlation between a genetically unrelated surrogate mother and child's intelligence.
I don't know about exclusively.
You're right that that was too strong; I should have said it's determined largely by the mother's genetics (but also to lesser degrees by the father's genetics and environmental factors.) But note that the strongest known environmental factor, alcohol consumption, is at least somewhat genetic (http://psychiatry.healthse.com/psy/more/alcoholism), and other factors like susceptibility to smoking addiction probably are as well.
Maternal Stress affects offspring.
So does malnutrition.
Any given chemical is not equally likely to cause pleasure for human beings, so of course alcohol and nicotine consumption have a genetic basis. It seems equally obvious that the availability of alcohol and nicotine are part of the environment. Additionally, they are parts of the environment where it is easy to imagine life being substantially similar without them (unlike environmental influences such as oxygen and gravity).