One of the mysteries of the English language finally explained.
Relating to or denoting an allele or chromosomal abnormality which impairs the viability of most of the individuals homozygous for it.
- ‘Some of the genes that gives the mouse its common colours or markings also makes the mouse sick, or unfit to live. These genes are called semi-lethal or lethal.’
- ‘A chief difficulty in arguing for macroevolution by mutations is the fact that most expressed mutations are either lethal or semi-lethal.’
- ‘Pokey (pok), a sex-linked recessive semi-lethal gene in Tribolium castaneum has been described.’
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