Attentiоn-deficit hyperаctivity disоrder (ADHD) is а prevаlent neurоdevelopmental disorder with a major genetic component. ADHD is polygenic. In 2023, scientists examined 38,691 individuals with ADHD and 186,843 without ADHD. The scientists identified variants in 76 genes that were correlated with ADHD. These are considered risk variants. To develop ADHD does an individual's genome need to have risk variants in all 76 genes? [No] Could one or more of these risk variants be found in the genomes of someone without ADHD? [Yes]