> heritability of two eyes is near 0%. Isn't that just an example of poor sampling/ test hypothesis? Heritability of eyes should be 100% (as predicted) if you

> heritability of two eyes is near 0%. Isn't that just an example of poor sampling/ test hypothesis? Heritability of eyes should be 100% (as predicted) if you include people with genetic blindness. There obviously are genes for eyes, and they have a causal relationship with humans having eyes. They may have many variations that produce working eyes, but that doesnt mean the relation isnt causal. Maybe i miss how this relates to your greater point that genetic associations are just coincidental, not causal. Seems easy enough to test for the case of genetic intelligence. If you find a subset of genes within genetically diverse populations that cross culture, geography, and societies, then you would need a very strong rationale for coincidental association.