From The Telegraph:
5:00PM BST 10 Jul 2014
Chimpanzees raised by humans turn out to be no cleverer than those given an ape upbringing, research has shown.
Genes largely determine a chimp’s intelligence, a study has shown – and human intervention makes no difference to it at all.
Research into chimp intelligence could help scientists get a better handle on human IQ, say scientists. …
The new research involving 99 chimpanzees from a wide range of ages showed that genes explained about 50% of the differences seen in their intelligence test scores.
Chimps raised by human caretakers did no better in the tasks than individuals brought up by their chimpanzee mothers.