人類的21號染色體是23對染色體的其中之一，正常狀況下每個細胞擁有兩條。此染色體是所有人類染色體中最小的一個，含有大約4700萬個鹼基對，佔細胞內所有DNA的1.5%。
Quick Facts 21號染色體 ...
| 21號染色體
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| 物種
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Homo sapiens
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| 基因數量
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200-400
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21號染色體的定序是在2000年宣佈完成，是人類基因組計劃中第二條定序完成的人類染色體。此染色體內大約含有300到400個基因，依預測方式而有所不同。
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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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