There is a train of though in genetic theory known as the "Selfish Gene" theory. This theory was first put forward in a popular format by Richard Dawkins in his book of the same title, back in the 70's.
The argument is that genes are entities unto themselves, and use the human body as a host to provide a survival machine for the gene until it can replicate through breeding.
Essentially, this theory argues that it is incorrect to think that there is a purpose in life beyond survival, and that said purpose is in fact governed by genes seeking to protect their future at the expense of the organism in which it is hosted. In other word genetics determine an organism's behavior, and this behavior will always favor the future of the gene.
Nonetheless, "A body doesn't look like the product of a loose and temporary federation of warring genetic agents who hardly have time to get acquainted before embarking in sperm or egg for the next leg of the great genetic diaspora. It has one single-minded brain which coordinates a cooperative of limbs and sense organs to achieve one end. The body looks and behaves like a pretty impressive agent in its own right."
The selfish gene theory casts an interesting light on human behavior, and is a perspective well worth considering.
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