Down syndrome is described as which of the following?

Down syndrome is described as which of the following?

• A. A condition of intellectual disability and physical disorders caused by an extra copy of chromosome 21.
• B. A viral infection of the brain causing seizures.
• C. A degenerative muscular disease.
• D. A nutritional deficiency.

Answer: (A)

Down syndrome is a genetic condition present at birth, characterized by intellectual disability and distinctive physical features, caused by having an extra copy of chromosome 21. This extra chromosome leads to overexpression of genes on that chromosome, which influences development and the observed cognitive and physical traits. It is not caused by a viral brain infection, a degenerative muscular disease, or a nutritional deficiency.

Down syndrome is a genetic condition present at birth, characterized by intellectual disability and distinctive physical features, caused by having an extra copy of chromosome 21. This extra chromosome leads to overexpression of genes on that chromosome, which influences development and the observed cognitive and physical traits. It is not caused by a viral brain infection, a degenerative muscular disease, or a nutritional deficiency.