Jose has an extra chromosome on the twenty-first pair of chromosomes.The disorder was once referred to as mongolism.This will cause him to have

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Down syndrome is caused by the presence of an extra chromosome on the twenty-first pair, resulting in developmental delays, intellectual disability, distinctive physical features, and increased risk of certain health problems. It was previously referred to as mongolism, but this term is now considered offensive and outdated. Hemophilia, fragile X syndrome, and sickle-cell anemia are caused by different genetic abnormalities and have different signs and symptoms.

Jose Has an Extra Chromosome on the Twenty-First Pair of Chromosomes.The