Behavioral Science

Genetic Basis of Behavior 73
A 19-year-old male is brought to the emergency room by his college roommate for
delusions, hallucinations, and disorganized speech that has occurred for the last
7 months. The roommate is concerned that the patient may have schizophrenia. The
patient’s father was diagnosed with schizophrenia at age 22. Not taking into account
these new symptoms, what is the lifetime likelihood of this patient developing
schizophrenia?
The patient is a first-degree relative of an affected individual—he therefore has a
10% chance of developing schizophrenia.