人类的21号染色体是23对染色体的其中之一，正常状况下每个细胞拥有两条。此染色体是所有人类染色体中最小的一个，含有大约4700万个碱基对，占细胞内所有DNA的1.5%。
Quick Facts 21号染色体 ...
| 21号染色体
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| 物种
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Homo sapiens
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| 基因数量
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200-400
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21号染色体的定序是在2000年宣布完成，是人类基因组计划中第二条定序完成的人类染色体。此染色体内大约含有300到400个基因，依预测方式而有所不同。
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- 唐氏症候群
- Holocarboxylase synthetase deficiency
- Homocystinuria
- Jervell and Lange-Nielsen syndrome
- Leukocyte adhesion deficiency
- Nonsyndromic deafness
- Nonsyndromic deafness, autosomal recessive
- Romano-Ward syndrome
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