It is not genetically transmitted. Rather, it takes place by a process of absorption from the social environment or through deliberate instruction. No culture is possible without a language. It is bound up with language. This is an important prerequisite and therefore to kill a language is to kill a culture.
Culture is never static.
It is dynamic. Every moment we are being transformed, always growing - like the cells in our bodies. It changes exactly the same way as human beings change. We cannot romanticise our culture. Our grandfathers did not walk on the same top soil as we do and our children will have different soil.