According to family, twin, and adoption studies, a person is at greatest risk for developing schizophrenia ________.
A) if he or she has an identical twin diagnosed with the disorder
B) if he or she has a nonidentical twin diagnosed with the disorder
C) if he or she has an adoptive parent diagnosed with the disorder
D) if he or she has a biological parent diagnosed with the disorder

Question

According to family, twin, and adoption studies, a person is at greatest risk for developing schizophrenia ________.
A) if he or she has an identical twin diagnosed with the disorder 
B) if he or she has a nonidentical twin diagnosed with the disorder 
C) if he or she has an adoptive parent diagnosed with the disorder
D) if he or she has a biological parent diagnosed with the disorder

Quizplus · Accepted Answer

Identical twins share 100% of their genes, so if one twin has schizophrenia, the other twin has the highest risk of developing it compared to other familial relationships.

According to Family, Twin, and Adoption Studies, a Person Is