Blood Legacy

I am in the process of writing a paper on Celtic Art. In the course of my research I have been learning about the Celtic people. They began as scattered groups of 'barbarians' all across early Iron-Age Europe and into Asia-minor. They harassed an infant Rome and were a thorn in the empire's side throughout it's entire existence. A great wall was erected in northern Britain where the Romans were unable to go any further due to the fierce people that lived there. Indeed, these Celts eventually did their part to help collapse the Empire when its strength wained. In later years the Scotts were a pain to the English who agian tried to force a foreign leadership upon this wild people. They soon shook this off as well. The Celts were a fierce and undaunted people.
Now, I wonder. This people group has a great legacy. Everyone who can connect their bloodlines back to these people in some way shares in their legacy. I began to wonder as i read all of this, do the anchinet bloodlines that make up our genetic codes have some determining influence on the type of people that we are and the sort of personalities that we have? When faced with an obstacle of some kind do we draw from the reserves of our blood legacies? What were your forefathers capable of?