Although it is difficult to determine precisely how much of personality is determined by genetics, the results of twin studies suggest that genetics probably accounts for about _______ percent of the variance of adult personality.
A. 85
B. 60
C. 40
D. 5
Question 2
One problem with adoption studies is that the homes in which twins are placed
A. are so very different that comparisons cannot be made.
B. are often very similar because adoptive families are similar in important ways.
C. are highly specialized for adoptive parenting.
D. allow the same genetic influences to emerge.
The Central Dogma of Genetics
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