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21号染色体

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21号染色体
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。

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参考文献

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