Source: University of California - Santa Cruz Date: September 14, 2007 Extra Gene Copies Were Enough To Make Early Humans' Mouths Water Science Daily — To think that world domination could have begun in the cheeks. That's one interpretation of a discovery, published online September 9 in Nature Genetics, which indicates that humans carry extra copies of the salivary amylase gene. A member of the Hadza tribe of Tanzania roasts basketball-sized tubers, the type of starchy food thought to have been a crucial addition to the diet of early humans. (Credit: Photo by N. Dominy) Humans have many more copies...