Ed Yong ponders the ramifications of human DNA when compared to chimps and bonobos:
We might think that people from different corners of the world look very different, but our genomes tell a story of unusual uniformity. You can find are more genetic differences between chimps living in the same troop, than among all living humans. …
Less varied genomes mean that people (and children or neighbours in particular) become more similar, in both their physical traits and behaviour. In a population like that, “a cultural innovation like art or language might be more likely to persist,” says Gage. “If you have a unique event, like say a Picasso invents cubism, and you introduce it into the pack, it has a greater chance of being assimilated into the culture.”
This is all speculation for now.
The Dish 