A chromosomal abnormality is characterized by an extra copy of chromosome 21.A person with this disorder typically has a round face,a flattened skull,an extra fold of skin over the eyelids,a protruding tongue,short limbs,and retardation of motor and mental abilities.What is this disorder called?

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The Answer of A chromosomal abnormality is characterized by an extra copy of chromosome 21.A person with this disorder typically has a round face,a flattened skull,an extra fold of skin over the eyelids,a protruding tongue,short limbs,and retardation of motor and mental abilities.What is this disorder called?

A Chromosomal Abnormality Is Characterized by an Extra Copy of Chromosome