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2号染色体

2号染色体
一对2号人类的染色体 (位于G显带之后)。
一条来自于父亲,另一条来自于母亲。
一对2号人类(男性)染色体的核型
特征
长度(bp242,193,529
基因数量2,787
类型常染色体
着丝粒位置Submetacentric [1]
标识符
RefSeqNC_000002
GenBankCM000664
2号染色体
2号染色体
物种 (Homo sapiens)
基因数量 2,787

2号染色体人类的23对染色体之一。在正常的人类体细胞中,会有1对2号染色体。这条染色体是人类所拥有的第二大染色体,拥有2.37亿个碱基对,其占有的DNA大小,大约是细胞中DNA总数的8%。

2号染色体所拥有的基因数目并不确定,目前遗传学研究估计大约有1,888个基因[2]。重要的发育调控基因之一HOXD同源框基因簇位在这条染色体上。

演化

2号染色体可能是源自两个染色体的融合,证据是这条染色体与猿类的两条染色体吻合,以及退化的着丝粒(centromere)与端粒(telomere)[3]

参考文献

  1. ^ Table 2.3: Human chromosome groups. Human Molecular Genetics 2nd. Garland Science. 1999. 
  2. ^ NCBI Map Viewer - 2號染色體. [2007-04-11]. (原始内容存档于2019-11-16). 
  3. ^ Human Chromosome 2 is a fusion of two ancestral chromosomes页面存档备份,存于互联网档案馆) by Alec MacAndrew, Accessed 18 May 2006
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2号染色体
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