"A researcher who is seeking to understanding the role of genetics in the development of childhood schizophrenia might be in the field of:"

molecular genetics.

Explanation:

Schizophrenia in children is a rare but serious mental condition in which individuals abnormally perceive reality. It involves a range of mental, or emotional problems hallucinations, and highly disordered thoughts and actions that hinder the ability of your child to work. Molecular genetics uses molecular biology's laboratory techniques to link structural changes and sequencing of genetic variants to functional changes in protein function, and ultimately to health problems such as childhood schizophrenia in this scenario.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.