Two babies that come from different fertilized eggs may be
A. siblings.
B. dizygotic twins
C. unrelated
D. all of the above
Question 2Researchers using the twin study method take advantage of which naturally occurring phenomenon?
A. Monozygotic twins have identical genes.
B. Dizygotic twins have similar genes.
C. Monozygotic twins are often treated alike by parents.
D. Dizygotic twins are more alike genetically than typical siblings.
Question 3The twin study method is used by researchers to get around which methodological problem?
A. Biased samples
B. A confound between genetic and environmental influences
C. Questions about generalizability
D. Validity of measures
Question 4Siblings' personalities may be similar because
A. children inherited personality traits from their parents.
B. siblings share the same living environments during childhood.
C. siblings are raised in the same way by parents.
D. all of the above
Question 5Researchers have difficulty determining genetic influences on personality when they simply compare children with their parents. This is because
A. it is difficult to find comparable measures for children and adults.
B. genetic and environmental influences on personality are confounded when using this method.
C. it is difficult to find control groups that match the experimental groups.
D. we need to follow the development of the children's personalities for many years to determine genetic influences.
Question 6Suppose you design a personality study in which you plan to use the twin-study method. You are probably conducting research to examine the
A. influence of siblings on personality.
B. stability of temperament over time.
C. influence of genetics on personality.
D. effects of birth order on personality.
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