Answer:
biological psychologist
Step-by-step explanation:
A biological psychologist is a psychologist who addresses his patients' problems based on the body's biological processes. This practitioner believes that genetic, hormonal, nutritional, or other problems that occur within the human body have a direct influence on the psychological problems a patient may have.
An example of this can be seen in the question above, where Tom believes that a patient's genes may have an influence on the patient's personality.