If you 'enshrine' something, you give it a special status, so that it can't be questioned or challenged. By pre-ordained gene pool, i suppose the writer means that we would create a gene pool that reflects our biases and desires. It is unlikely that Ringo Starr would have resulted from planned breeding, and this shows the weaknesses. We'd want tall, handome/beautiful people corresponding to our idealised view of the best of humanity.
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