What do studies of concordance rates for schizophrenia in monozygotic (MZ) and dizygotic (DZ) twins show?
a. almost 100 percent concordance in MZ twins, 0 percent in DZ
b. very low rates of concordance in either type of twin
c. consistent evidence of higher concordance in DZ than MZ
d. consistent evidence of higher concordance in MZ than DZ
Answer: d.
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a. green cones being filled with red photopigment. b. a lack of cones. c. a lack of blue cones. d. red cones being filled with green photopigment. e. a lack of yellow cones.
Which of the following statements is supported by research on the role of genetic influences in unipolar
disorder? A) The more severe the depressive disorder, the greater the genetic contribution. B) Genes play a more significant causal role in bipolar disorders than they do in unipolar disorders. C) Twin studies do not consistently find evidence of an inherited susceptibility to depression. D) Bipolar and unipolar disorders are equally heritable.