Aviva Directory » Health & Well-Being » Conditions & Diseases » Human Genetics » Down Syndrome

Named after John Langdon Down, the British doctor who described the syndrome in 1866, Down syndrome, or Down's syndrome, is the most common cause of mental retardation and malformation in infants and children. Down syndrome occurs with the presence of an extra chromosome, known as trisomy 21. Here you will find extensive information on Down syndrome, including the genetics.



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