Research on the genetic predisposition toward schizophrenia has indicated that ________
a. the risk of schizophrenia for the unaffected twin, when an identical twin has schizophrenia, is greatly reduced if the twins have been reared apart.
b. among identical twins, when one twin develops schizophrenia the other twin has an 80 percent chance of developing schizophrenia.
c. children with two schizophrenic parents have a 27 to 46 percent lifetime risk of developing schizophrenia, compared to a risk in the general population of about 1 percent.
d. children with one schizophrenic parent have about the same risk of developing schizophrenia as do people in the general population.
Answer: c
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a 6-month-old girl a 1-year-old boy a 7-year-old girl a 16-year-old boy
According to Ekman's research on facial expressions ________
a. when people try to hide their feelings with an inauthentic expression, they use different groups of muscles than they do for authentic emotions. b. authentic smiles last ten seconds or more, whereas false smiles last only about two seconds. c. when trying to feign sadness, only about 60 percent of people manage to get the eyebrows, eyelids, and forehead wrinkle exactly right. d. there is little support for Darwin's evolutionary theory that certain human facial expressions are innate.