According to family, twin, and adoption studies, a person is at greatest risk for developing schizophrenia if he or she has a(n) __________ diagnosed with the disorder.

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Identical twins have the highest risk for developing schizophrenia if their twin also has the disorder, indicating a genetic component to the disorder. Nonidentical twins and adoptive parents also have an increased risk compared to the general population but not as high as identical twins. Biological parents also have an increased risk, but the risk is not as high as for identical twins because there may be environmental factors at play in addition to genetics.

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