致死基因(lethal genes)：使生物体不能存活的等位基因。致死作用可以发生在个体 发育的各个时期。
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absolute lethal genes 完全致死基因
balanced lethal genes 平衡致死基因
genetic lethal genes 遗传性致死基因
ecological lethal genes 生态性致死基因
unconditional lethal genes 完全致死基因
以上来源于: WordNet
Most of the mutants mentioned above were lethal mutations, which may be associated with lethal genes.
上述突变体大多为致死性突变，推测其可能与致死性基因突变有关。
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The genes of mice and human beings have been conserved by evolution, partly because changes to genes are lethal.
FORBES: Scientists Ask: What Is A Gene, Anyway?
Gene therapy's tantalizing attraction is that a single treatment has the potential to cure lethal diseases by enabling normal genes to take over for defective ones.
WSJ: The Future of Medicine Is Now: Medical Innovations
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