Most psychologists believe that development, like intelligence or personality, reflects the action and mutual influence of genes and environment. The most important question concerning nature and nurture is:

Answer: how much does each contribute?

Explanation:

Nature and nurture of the pyschological traits such as intelligence or personality are contributed by the internal genes and the environment. The question arises is the fact that how much each factor that is the internal genetic structure as well as the external environment contributes to the development of these traits. It is the concern of the pyschologists.