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删除（英语：Deletion）在遗传学中有时也称为删除突变或微删除，指染色体或DNA序列的一部分发生缺失，进而失去这些遗传物质。删除的程度不一，可能是单一碱基对，也可能是整个染色体[1]。此种作用可于减数分裂中，染色体互换时产生，是某些遗传疾病的成因。
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