Of course there are innate factors and learned/environmental factors, but the relationship between genetic predisposition and learning are huge, and they magnify each other.

A human infant at birth has a brain size similar to a chimpanzee, but the human's brain grows much, much larger and more complex over the next decade of two. Human brains also grow to support the cognitive burdens they're directed to: people who study music intensively rather than baseball will grow distinctive brain folds, for example.