geneticism
/dʒɪˈnɛtɪsɪz(ə)m/noun
1The belief that the nature or value of any phenomenon can be understood by recognition of its place in a process of development; historicism.
2The attribution of sole, extreme, or excessive importance to the role of genes or heredity in the causation of disease, behaviour, etc.
Origin
Early 20th century. From genetic + -ism.