Which of the following is true of identical twin studies?

A) It is clear that fraternal twins reared together are more likely than identical twins to exhibit similar behaviors.
B) The study of monozygotic twins is important because it helps us, to some extent, identify genetic versus environmental causes of behavior.
C) Even biological characteristics such as hair and eye color are somewhat influenced by environment.
D) The study of dizygotic twins is important because it helps us rule out environmental causes of behavior.

B

Psychology

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

A) identical twin diagnosed with the disorder. B) nonidentical twin diagnosed with the disorder. C) adoptive parent diagnosed with the disorder. D) biological parent diagnosed with the disorder.

Psychology

Researchers have discovered that the brain volume of individuals with schizophrenia is less than normal. This decrease in brain volume is accompanied a corresponding

A) decrease in the size of the ventricles. B) increase in the size of the ventricles. C) decrease in the size of the skull. D) increase in the size of the skull.

Psychology