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

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Studies show that identical twins, who share 100% of their genes, have a much higher risk of developing schizophrenia if their twin also has the disorder compared to nonidentical twins, who only share 50% of their genes. This suggests a strong genetic component to schizophrenia. While adoptive parents and biological parents may also have an influence on a person's risk for schizophrenia, the strongest predictor is having an identical twin with the disorder.

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