Zack is less likely to be stopped by temporary setbacks, and more likely to deal with problems head-on. He tends to be less anxious and stressed and takes better care of himself because he believes that his efforts to stay healthy will succeed. Zack would best be described as a(n)

A psychologist tested Brian and found his overall IQ was 45. Yet Brian can add, subtract, multiply, and divide large numbers with lightning speed and consistent accuracy. What term is used for Brian's exceptional ability?

a) autistic b) savant syndrome c) Down syndrome d) selected giftedness

Who is more affected by X-linked inherited disorders?

a. females b. males c. children under one year of age. d. adults with mutations