A study dating the age of more than 1 million single-letter variations in the human DNA code reveals that most of these mutations are of recent origin, evolutionarily speaking. These kinds of mutations change one nucleotide - an A, C, T or G - in the DNA sequence. Over 86 percent of the harmful protein-coding mutations of this type arose in humans just during the past 5,000 to 10,000 years. Some of the remaining mutations of this nature may have no effect on people, and a few might be beneficial, according to the project researchers...
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