Why does everyone with Down syndrome look the same? Short fast 1 minute answer

one of the important genetic disorders in human that cause Down Syndrome shows a similar phenotype in it’s patients and usually people asked:

Why do people with Down syndrome look the same? They have an extra chromosome or part of an extra chromosome. Researchers believe that this extra genetic material affects growth of the maxilla (part of the skull) and the bone, cartilage, and connective tissue in the head, known as the cranial neural crest.

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