Answer:
increase; do not increase
Step-by-step explanation:
Schizophrenia: In abnormal psychology, the term schizophrenia is referred to as a chronic and a serious mental health illness in which an individual's behavior and thoughts get impaired and if it's left untreated then it can often lead to psychosis. An individual experiencing schizophrenia often encounters hallucinations, paranoid or false believes, and disorganized thinking.
If the biological parent of an adopted child has a history of schizophrenia then the risk of the child getting the same disorder increases due to genetics and therefore if the child has less risk of getting the disorder if the adopted parents have schizophrenia.