... regions showed equal results for risk genes, there was still no conclusive evidence of any region as to where the disorder could be linked. However, science never relies on one test or experiment, and several other tests were done too. In one of the tests, a region found a risk-gene region that was extremely promising. Even more research was conducted on a large ... with ADHD. This variation was a common trait among humans long ago. It is believed to be a part of the evolutionary process. This variation gene is also a contributor to the addictive personality. This variation is in many d...

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• Grade Level: High School