Research on the role of heredity in temperament indicates that ________.
A. heritability estimates derived from twin studies suggest a moderate role for genetic factors in the development of temperament but less of a role in the development of personality
B. identical twins are more similar than fraternal twins across a wide range of temperamental traits and personality measures
C. only 5 to 10 percent of individual differences in temperament can be attributed to differences in genetic makeup
D. heritability estimates are much higher for expressions of positive emotion than for negative emotion
Answer: B
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Fill in the blank(s) with the appropriate word(s).