21號染色體
| 21號染色體 | |
|---|---|
 | |
| 物種 | Homo sapiens |
| 基因數量 | 200-400 |
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%。
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。
相關疾病
[編輯]- 阿茲海默症第一型
- 肌肉萎縮性側索硬化症（漸凍人症）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
參考文獻
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