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I would have to say that natural selection is almost non-existent in our species.
Not only because we have the capability to make even the weakest specimens survive and have a chance at reproduction but also because our ideas of a perfect mate are influenced by society.
For example, the west’s version of an attractive woman is an anorexic, prepubescent woman with fake breasts. Such traits would mean that the woman is easily influence by social standard (gullible, un-intelligent). She would have faulty reproduction capabilities due to hormonal imbalance cause by her low weight. She would bear weak children because she does not have the energy to support a child within her. Her condition would increase the chance of complications during birth. Finally she would not be able to breast-feed the child.
Our medicine has the capability to bypass all these hindrances so that they do not seem to matter. Yet this obviously does not produce the strongest possible specimens in our species.
Soon enough humanity will take evolution into its own hands though the possibilities of bio-engineering and cybernetics. While such paths will lead to difficulties they are our only hope of becoming greater then what we are today.
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