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The answer to the original question (I see nazism above, don't know where the thread has gone) is no. As long as people with down syndrome and dwarfism are mating (and they are), there can be no way for the defective gene to be bred out. I saw someone talk about this, basically unless someone has a fatal genetic disease they live and have a good chance of passing on the bad material. For example, Marfan's Syndrome, a disease that affects connective tissue, was almost completely caused by mutations before the 20th century. This means that before that time, anybody who had it died before they could pass on the condition, because of torn aorta or swollen brain casing. Nowadays, a comatose Marfan's sufferer can live into his/her 60's and easily pass on this genetic material, and as a result, we cannot evolve to not have it in the gene pool.
Basically, unless we just let dwarves, Turner syndrome-children, and all the other genetic-defectives die at birth, we won't evolve -- not that I advocate that!!!
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