New answers tagged molecular-evolution
Richard Dawkins discusses this in his book The Greatest Show on Earth: The Evidence for Evolution Bacteria and other microorganisms, specifically Archaea, are able to exchange in a sort of 'copy and paste' genetic exchange that differs wildly from sexual reproduction. They can even exchange genes with other distantly related species. This, coupled with ...
http://www.livescience.com/46986-human-genome-junk-dna.html Microorganisms are often able to adapt to new environments quickly, but they lack the specialized functions of macro-organisms. Consider that the micro-organisms of macro-organisms have developed to form machinery that builds solutions to problems, rather than being retrofitted themselves to ...
Deinococcus radiodurans did not "develop resistance to mutations". It is able to repair its chromosome when scatered in pieces by radiations or desiccation, while other bacteria would die in such conditions. So this is adaptive in extreme environments, such as deserts (where it has evolved) or canned corned beef (where it was discovered).
Is background radiation a critical component of evolution? No, it most certainly is not. The DNA replication and DNA repair mechanisms aren't perfect and errors happen without any external cause or catalyst. You could say mutations happen on their own. There are mutagens that also cause DNA damage or mutations, but they're merely affecting the DNA ...
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