21号染色体
（重定向自21号染色体 (人类)）
| 21号染色体 | |
|---|---|
 | |
| 物种 | Homo sapiens |
| 基因数量 | 200-400 |
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。
相关疾病
[编辑]- 阿兹海默症第一型
- 肌肉萎缩性侧索硬化症（渐冻人症）第一型
- 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
参考文献
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