In the analysis of heritability, one potential problem in the double-the-difference method is that it assumes that twins
a. do not differentially interact with each other.
b. are the same sex.
c. are genetically identical.
d. are reared under equal environments.
Answer: d: are reared under equal environments.
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Grace, a third grader, is beginning to get many of her permanent teeth. Her mom is concerned because Grace's permanent teeth seem much too large. What can you tell Grace's mom?
A) Grace's permanent teeth will appear shorter as they "settle" in to her jaw. B) As Grace loses all 24 of her primary teeth, the permanent teeth will appear smaller. C) As Grace's neck and torso grow, her teeth will appear smaller. D) Grace's jaw and chin bones will grow to accommodate the newly erupting teeth.
When is the worst time for children who have experienced divorce?
a. the first two months b. one year later c. two years later d. when the children enter college