It seems to me possible that if people select their offspring intentionally based on genetic information, then we will tend to have less diversity of outcomes, which will impact evolution,
CORRECTAMUNDO!!!
Evolution is defined as natural selection of random mutations. It's surprising just how many geeks, who should be very familiar with what "random" means, will still advocate the idea of genetic selection and manipulation of offspring. I personally think it's from reading too many sci-fi novels in which "genetic manipulation" results in supermen or the like.
Once our society begins selecting and/or rejecting offspring based on their genes, or we begin manipulating our genetic codes, evolution stops. We won't have moved into another kind of evolution. We won't be make our evolution more efficient. We'll have stopped evolving altogether, at least in the only way we understand the evolution of organism.
In technical terms, we will have moved humanity from a local random search to a heuristics based local search. The difference cannot be emphasized enough. Here we have a local random search for better organisms that has delivered incredible(literally to some) results over millions of years. Yet people are proposing replacing that system with heuristics that have no other qualification other than certain people think they will lead to improvement. Genetic manipulation advocates fail Optimisation 101.
Some will argue that parents have the right to procreate in any way they choose. But as I've advocated before, rights do not scale up. Just because it seems right that one person should be able to do something, you cannot just inductively apply that logic to the entire population. And when you grant a right, that's exactly who you grant it to. Everybody.
I'd liken genetic manipulation to interbreeding. Some people think it should be moral to marry your cousin or even sibling. They can even make a good case for why they should be entitled to do so. But if you scaled that right up to the entire populations, we'd all end up inbred, sickly and probably mentally retarded within a hundred or so years. Genetic selection promises much the same outcome, except genetic homogeneity will occur on a population wide scale.
Inductively scaling procreation rights up can easily lead us to a tall, trim, blue eyed, blond haired, heap of flu-ridden corpses. The very fact that this clinic offered such frivolities as eye and hair colour screening shows that this is exactly what will happen if we replace proven randomness with such vapid heuristics.
May the Maths Be with you!
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