Which of the following is true about the origins of ADHD?
A) ADHD runs in families and is highly heritable.
B) Fraternal twins share ADHD more often than identical twins.
C) The brains of children with ADHD grow more quickly than the brains of unaffected agemates.
D) The brains of children with ADHD are about 3 percent larger in volume than the brains of unaffected agemates.

Question

Quizplus · Accepted Answer

ADHD has a strong genetic component, and studies have found that it runs in families and is highly heritable.

Answer: B
 Identical twins are more likely to share ADHD than fraternal twins, indicating that there is a genetic component to the disorder.

Answer: D
 Several studies have found that the brains of children with ADHD are, on average, about 3 percent larger in volume than the brains of unaffected agemates. This may be due to differences in brain development or genetics.

Note: There is no evidence to support option C. In fact, some studies have suggested the opposite- that the brains of children with ADHD may develop more slowly or differently than those of unaffected children.

Which of the Following Is True About the Origins of ADHD