Children who have an abnormal change in one of the genes on their X chromosome suffer from
A) fragile X syndrome.
B) Down syndrome.
C) Turner's syndrome.
D) Xenophanes syndrome.
Question 2Children who have a third copy of chromosome 21 in their DNA suffer from
A) fragile X syndrome.
B) Down syndrome.
C) Turner's syndrome.
D) Xenophanes syndrome.
Question 3Children are likely to be identified as mentally retarded if their IQ scores are below the cutoff point of
A) 60 or 65
B) 70 or 75
C) 80 or 85
D) 90 or 95
Question 4Children are likely to be described as gifted if their IQ scores are greater than approximately
A) 132.
B) 142.
C) 152.
D) 162.
Question 5Studies have shown that the roots of extreme giftedness in children are
A) entirely genetic in nature.
B) entirely due to environmental influences.
C) due to a combination of heritable and environmental factors.
D) impossible to determine in any meaningful way.
Question 6The outcomes of preschool enrichment projects such as the Abecedarian Project indicate that
A) early intervention programs are ineffective.
B) children's achievement scores can be improved, but IQ is stable over time.
C) children's IQ scores can be improved through environmental intervention.
D) there is nothing conclusive to say about the effects of the environment on IQ.
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