The most common form of inherited mental retardation, caused by a mutation in a single gene, is known as ____.

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Fragile X syndrome is the most common form of inherited mental retardation and is caused by a mutation in a single gene. Downs syndrome is a genetic disorder caused by the presence of an extra chromosome 21. Fetal alcohol spectrum disorder is a condition caused by prenatal exposure to alcohol. Cerebral palsy is a group of disorders that affect movement and posture and is caused by damage to the brain during development.

The Most Common Form of Inherited Mental Retardation, Caused by a Mutation