____________ is the most common form of mental retardation resulting from chromosomal abnormalities.

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Down syndrome is caused by the presence of an extra copy of chromosome 21, also known as trisomy 21. It is the most common genetic cause of intellectual disability, affecting approximately 1 in every 700 births. Klinefelter's syndrome, Fragile-X syndrome, and Prader-Willi syndrome are also genetic disorders that can cause intellectual disability, but they are less common than Down syndrome.

____________ Is the Most Common Form of Mental Retardation Resulting