Question

Animal evidence suggests that one reason for an inconsistency in results from studies regarding the risk of attention-deficit hyperactivity disorder (ADHD) in individuals who are homozygous for a chromosome-5 gene (DD) may be that
A) there are no environmental influences associated with ADHD.
B) environmental influences associated with ADHD modify the gene's activity.
C) the gene has no role in the occurrence of ADHD symptoms.
D) the DD genotype is only present in about 10 percent of the population.

Answer

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