Which correlation provides the strongest evidence for an environmental influence on intelligence?
a) between brothers and sisters
b) between children and their parents
c) between adopted children and their adoptive parents
d) between adopted children and their biological parents
C
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Animal evidence suggests that one reason for an inconsistency in results from studies regarding the risk of attention-deficit hyperactivity disorder (ADHD) in individuals who are homozygous for a chromosome-5 gene (DD) may be that
A) there are no environmental influences associated with ADHD. B) environmental influences associated with ADHD modify the gene's activity. C) the gene has no role in the occurrence of ADHD symptoms. D) the DD genotype is only present in about 10 percent of the population.
The higher incidence of conversion disorders during Freud's time has been attributed to:
a) Prevalent sexually repressive attitudes. b) Pervasive belief in mystics and magical thinking. c) The high incidence of unreported sexual abuse. d) Clinicians inadvertently creating the disorder through hypnosis.