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Definition of Lethal gene
1. Noun. Any gene that has an effect that causes the death of the organism at any stage of life.
Definition of Lethal gene
1. Noun. any gene which brings about the death of an organism carrying it; usually the result of a mutation ¹
¹ Source: wiktionary.com
Medical Definition of Lethal gene
1. A gene that produces a genotype that leads to death of the organism before reproduction is possible or that precludes reproduction; for a recessive gene the homozygous or hemizygous state is lethal. (05 Mar 2000)