I think you may be misunderstanding what I'm saying. Say we have two groups: Group A, who have been enhanced by eugenics, and Group B, who have not been enhanced. Being human, individuals of both groups will seek to procreate with whom they wish. Chances are, that means, in many cases, procreation between the two groups.
If Group A is selectively bred to be more intelligent, and then they go and breed with Group B, offspring of Group B will eventually begin to show signs of higher-than-average intelligence. Unless, of course, Group B somehow managed to breed in a really stupid gene.
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