Twin studies have found concordance rates of 63 to 87 between identical twins for obsessive-compulsive disorder (OCD). What does this suggest?
a. OCD prevalence and behaviors vary by culture.
b. OCD has a strong genetic vulnerability.
c. OCD is a learned behavior through classical conditioning.
d. OCD can be attributed to evolutionary causal factors.
Question 2
Of the following, who is demonstrating a compulsion?
Ellen, who worries about the contamination on other peoples hands and on door knobs at her office
a. Andrew, who has a precise, daily coffee-making routine that cannot be disrupted
b. Diane, who has repeated doubts as to whether she turned the stove off before she left for work
c. Henry, who keeps picturing himself hitting his boss
d. Ellen, who worries about the contamination on other peoples hands and on door knobs at her office
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Fraternal twins share about 50 percent of their segregating genes.
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