I suspect this has been explored in Science Fiction, though I've never read anything in which this idea was put into practice.
Anne McCaffery's Nimisha's Ship mentions it as a duty of the first colonists of a planet. Important families from colonized worlds still check for any harmful combinations of recessive genes before siring a child. The book is more about the politics and cool space ships though.
This thread is intended to provide a space for 'crazy' ideas. Ideas that spontaneously come to mind (and feel great), ideas you long wanted to tell but never found the place and time for and also for ideas you think should be obvious and simple - but nobody ever mentions them.
This thread itself is such an idea. Or rather the tangent of such an idea which I post below as a seed for this thread.
Rules for this thread:
If this should become a regular thread I suggest the following :