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Downs综合征是最常见的也是首先被发现的染色体异常疾病。1846年Seguin当时认为是呆小病的一个特殊型,1866年Zohnlan gdonHaydonDown描述本症在精神迟钝患者中有特殊的颜貌。在全人类均可见到的一种
Downs syndrome is the most common and first chromosomal abnormality. 1846 Seguin was considered a particular type of ailment, Zohnlan gdonHaydonDown 1866 described the disease in patients with mental retardation have a special look. One that can be seen in all mankind