After the human and chimpanzee genomes were sequenced and compared, it was usually impossible to tell whether differences were the result of the human or chimpanzee gene changing from the common ancestor.
Unha vez que se secuenciaron e compararon os xenomas humano e do chimpancé, era xeralmente imposible dicir se as diferenzas eran ou non resultado dos cambios dos xenes humanos ou de chimpancé a partir do devanceiro común.