Even using the evil of eugenics to select for the most advantageous combinations of genetic traits wouldn't reduce the average mutational load or the accumulation rate of approximately 100 new coding mistakes per person per generation.
Assuming it would be possible to get everyone closer to the original code through more cross-breeding, I think the only useful result would be to reduce genetic extremes that are weaker in certain environments, but damage from ever more deleterious mutations would continue unabated until the human race is no longer viable.
As Dr. Sanford has said,
The extinction on the human genome appears to be just as certain and deterministic as the extinction of stars, the death of organisms, and the heat death of the universe.
Here's an interesting take on the situation from an evolutionist engineer who also recognizes the inevitable: http://www.onelife.com/evolve/degen.html#mutate
Ron Paul - Honorary Founding Father
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