The origins of new genes.......

HERE (LINK) is a nature education article on the topic of how new gene originate (in case you want to go beyond biofundamentals).

Then there is a molecular evolution article on the identification of new genes in the primate/human lineage associated with brain function (link HERE).  The surprising observations: i) there are lots of new genes and ii) that are expressed early in neural development.

Here is a nice review of the major mechanisms responsible for Gene Duplication and their subsequent evolution or elimination (link HERE).