There was a good article about this in the April 2004 issue of Scientific American (paywalled, unfortunately; the name of the article is "Evolution Encoded"). I

There was a good article about this in the April 2004 issue of Scientific American (paywalled, unfortunately; the name of the article is "Evolution Encoded"). It's about how similar gene sequences result in similar proteins, so that mutations don't necessarily result in death. http://www.scientificamerican.com/article/evolution-encoded/ http://www.scientificamerican.com/article/evolution-encoded/