NATURAL selection may have changed almost one in ten of our genes since we split from other apes. Genes affected include ones connected to speech and hearing, and others involved in the development of the brain and skeleton. While it is too early to say whether these changes are the defining attributes that made us human, the researchers who made the discovery say it shows how fast our ancestors have evolved over the past 5 million years.
The results come from a comparison of over 7600 genes in humans and chimpanzees, the first study of its kind to compare so…
