The most common genetic condition resulting in intellectual disabilities is

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Down Syndrome is caused by the presence of an extra copy of chromosome 21, and is the most common genetic condition resulting in intellectual disabilities. Phenylketonuria and Tay-Sachs disease are inherited conditions that can cause intellectual disabilities, but they are less common than Down Syndrome. Lead poisoning is not a genetic condition, but exposure to lead can lead to developmental delays and intellectual disabilities.

The Most Common Genetic Condition Resulting in Intellectual Disabilities Is