Which of the following is caused by a gene on the X chromosome?

A) Tay-Sachs disease
B) Color blindness
C) PKU
D) Sickle-cell disease

B

Psychology

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Davis has such an intense, irrational fear of clowns that he cannot take his daughters to see the circus when it is in town. Davis would be most correctly diagnosed as suffering from

A) obsessive-compulsive disorder. B) panic disorder. C) a phobia. D) posttraumatic stress disorder.

Psychology

Day care research in the 1980s suggested that attachment is affected if the infant

A) spent more than 40 hours per week in day care. B) was placed in day care before 6 months old. C) was placed in day care after 9 months old. D) spent more than 20 hours a week in day care.

Psychology