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Just because something doesn’t do what you planned it to do doesn’t mean it’s useless.

 

Thomas Edison

Evolutionary adaptations in organisms can be reversed, but rarely

RATE THIS! +52
Posted in Science on 7th Jul, 2015 01:05 AM by AlexMuller

Evolution in bacteria shows that adaptations can be undone, but rarely. Ever since Darwin proposed his theory of evolution, scientists have wondered whether evolutionary adaptations can be reversed. Answering that question has proved difficult, partly due to conflicting evidence.

 

In 2003, scientists showed that some species of insects have gained, lost and regained wings over millions of years. But a few years later, a different team found that a protein that helps control cells' stress responses could not evolve back to its original form.

 
Jeff Gore, assistant professor of physics at MIT, says the critical question to ask is not whether evolution is reversible, but under what circumstances it could be. "It's known that evolution can be irreversible. And we know that it's possible to reverse evolution in some cases. So what you really want to know is: What fraction of the time is evolution reversible?" he says.
 
By combining a computational model with experiments on the evolution of drug resistance in bacteria, Gore and his students have, for the first time, calculated the likelihood of a particular evolutionary adaptation reversing itself. They found that a very small percentage of evolutionary adaptations in a drug-resistance gene can be reversed, but only if the adaptations involve fewer than four discrete genetic mutations.

Tags: evolutionbiologylifegeneticsresearchbacteria

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Comments

Author: Guest
Posted: 2015-07-07
+2
Excellent work! The ability to reverse adaptation should be proportional to number of changes that are required for a specific adaptation and here the is even suggestion of a cut off: 4 genes
1 Replies
Author: Guest
Posted: 2015-07-07
+0
It could all depend on species and how many genes are involved in particular phenotypes Reply
Reply


 

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