21號染色體
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 | |
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物種 | Homo sapiens |
基因數量 | 200-400 |
21號染色體的定序是在2000年宣布完成,是人類基因組計畫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
编辑参考文献
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