Induced mutations followed by selection in laboratory experiments have not produced any beneficial structural changes.
Most all mutations are detrimental, a few are neutral, and extremely few if any are clearly beneficial.
Bacteria make major evolutionary shift in the lab
quote:
A major evolutionary innovation has unfurled right in front of researchers' eyes. It's the first time evolution has been caught in the act of making such a rare and complex new trait.
And because the species in question is a bacterium, scientists have been able to replay history to show how this evolutionary novelty grew from the accumulation of unpredictable, chance events.
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