Studies investigating the behavioral genetics of ADHD have found which of the following?
A) Environment plays a stronger role in the development of the disorder than genetics does.
B) Concordance between twins is higher for inattentive than hyperactive-impulsive symptoms.
C) The siblings of those with ADHD are no more likely to have the disorder than controls.
D) Adopted children are more similar to their biological parents than to their adoptive parents with respect to ADHD symptoms and diagnosis.

Question

Quizplus · Accepted Answer

Studies have found that adopted children are more likely to exhibit ADHD symptoms and be diagnosed with the disorder if their biological parents also had ADHD, suggesting a genetic component. Concordance between twins is higher for hyperactive-impulsive symptoms, but there is still genetic influence on both types of symptoms. The heritability of ADHD is estimated to be around 70-80%, indicating that genetics play a significant role in the development of the disorder. The role of environment is also important, but it does not negate the genetic influence. The siblings of those with ADHD are more likely to have the disorder than controls, with the risk increasing as the degree of relatedness increases.

Studies Investigating the Behavioral Genetics of ADHD Have Found Which