semilethal gene

semilethal gene

[¦sem·i′lēth·əl ′jēn]
(genetics)
A mutant causing the death of some of the individuals of the relevant genotype, but never 100%. Also known as sublethal gene.
References in periodicals archive ?
Although no genetic studies have been performed, it seems likely that the green morphs carried a semilethal gene. As mentioned earlier, the incidence of green hatchlings was not recorded accurately; however, they always appeared together with normal phenotypes from the same egg pods.