A chromosomal disorder characterized by moderate-to-severe mental retardation and a downward-sloping skin fold at the inner corners of the eyes is called

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Down syndrome is characterized by the presence of an extra chromosome 21, which causes moderate-to-severe mental retardation and a characteristic facial appearance that includes a downward-sloping skin fold at the inner corners of the eyes. Cystic fibrosis is a genetic disorder that affects the lungs, pancreas, and other organs, Tay-Sachs disease is a rare genetic disorder that affects the nervous system, and sickle-cell anemia is an inherited blood disorder. None of these disorders are associated with the specific symptoms described in the question.

A Chromosomal Disorder Characterized by Moderate-To-Severe Mental Retardation and a Downward-Sloping