GENE AMPLIFICATION. “A significant part of the paralogous gene content of the ancestral eukaryotic gene content seems to be a result of lateral gene transfer, which, at least in part, was acquired via the endosymbiosis that gave rise to the emergence of the mitochondrion.” The ancient symbiotic bacteria that became our nucleus supplied many genes to our repertoire. Genes outsourced?
http://www.biochemsoctrans.org/content/41/1/451.full