Evolution

Perhaps the idea of evolution occuring during the lifetime of an individual needs to be reexamined. The experience being added to the DNA blueprint, would be of great evolutionary benefit. In the consummation of a new DNA strand by two individuals, what is the force that propels the evolutionary adaptations that nature dictates into the newly formed helix? It does not seem to be in nature's best interest to grant us long life if she does not benefit from the vast experiences that we collect.