A researcher is investigating the biological and psychological characteristics of a sample of individuals with XYY syndrome. Which of the following is he likely to find?
a. They have criminal records.
b. They experience delusions and hallucinations.
c. Their mean IQ is about 10 points lower than average.
d. Their behavior is likely to meet the criteria for pervasive developmental disorder.
Question 2
A researcher has collected nationwide data for the age of mothers at the time they give birth and the incidence of Down syndrome. What relationship between maternal age and Down syndrome is this researcher likely to find?
a. a very weak relationship
b. incidence of Down syndrome increases among those born to mothers who are older
c. incidence of Down syndrome decreases among those born to mothers who are older
d. incidence of Down syndrome increases among mothers under the age 35
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Biological Molecules