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PoindexterOglethorpe

(25,855 posts)
13. So if there are no selective pressures to eliminate wisdom teeth,
Sat Apr 20, 2019, 11:40 AM
Apr 2019

why is one in four people missing at least one wisdom tooth?

While Lamarck was wrong in thinking that acquired traits could be passed on, you must be aware of the research that shows that environmental conditions can turn some genes on or off, or that prenatal conditions can matter, and can affect descendants several generations on.

Selective pressure isn't simply people with a trait dying before they can reproduce. It can be selective if there's simply a small but real advantage and so that those with the trait have more children. If you are defining selective evolution as one that massively transforms an entire population, well that definition overlooks the very real changes that happen in smaller segments of the population. Just because I can't name the mechanism, doesn't mean it doesn't exist. The example of the gene that causes the "asian flush" response to alcohol turns out to be connected to the enzyme that is a factor in developing esophageal cancer from drinking alcohol is one such. I'm sure it took some interesting research to figure that one out.

Here's a link to just one recent article about human evolution. https://phys.org/news/2018-11-human-evolution-possibly-faster.html

If people like that say human evolution is happening and even speeding up, I'm going to trust their judgement. Oh, and you might want to click on the link at the bottom of that article, the one that says Natural selection is not the only process that drives evolution.

Latest Discussions»Culture Forums»Anthropology»Evolution of the human fa...»Reply #13