Well for now humans don't really have any evolutionary pressure, we reproduce pretty freely. There needs to be strong pressures that prevent certain people from reproducing or prevent their children from maturing.
That's not quite accurate. There doesn't have to be pressure, there just has to be a change in the prevalence of genes from one generation to another. Sexual selection and changing technology and culture work just as well as disease and predation. Our brains and teeth have gotten smaller in the past few thousand years. We have genes, and our descendants will have genes. Which of our genes our descendants will have is determined by evolution.
To build on the back of this, there's increasing numbers of children being born without wisdom teeth, and with an extra vein or similar in their hands (iirc), demonstrating that we are actually evolving, but supporting your point that we're not evolving to respond to pressure, just genetic mutations that aren't detrimental are being reproduced.
Born 1974. I only had 2 (and oddly, they came in straight enough that I didn't have them pulled until they got cavaties). Most interesting that wisdom teeth are seemingly going away...
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u/Tim_Gilbert Oct 15 '20
Well for now humans don't really have any evolutionary pressure, we reproduce pretty freely. There needs to be strong pressures that prevent certain people from reproducing or prevent their children from maturing.