Jamal has an extra chromosome on the twenty-first pair of chromosomes, causing him to have

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Down syndrome is caused by the presence of an extra chromosome on the twenty-first pair of chromosomes. Hemophilia is an inherited disorder that affects the blood's ability to clot and is caused by a mutation in one of the clotting factor genes. Fragile X syndrome is a genetic disorder caused by a mutation in the FMR1 gene, which affects cognitive and behavioral development. Sickle-cell anemia is a genetic disorder caused by a mutation in the HBB gene, which affects the production of hemoglobin and causes red blood cells to become misshapen.

Jamal Has an Extra Chromosome on the Twenty-First Pair of Chromosomes