21号染色体
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%。
| 21号染色体 | |
|---|---|
 | |
| 物种 | Homo sapiens |
| 基因数量 | 200-400 |
21号染色体的定序是在2000年宣布完成，是人类基因组计画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。
相关疾病
参考文献
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