semilethal


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semilethal

adjective Referring to a mutant gene which is lethal if present on both of a pair of genes—i.e., in the homozygous state—as occurs in autosomal recessive traits.
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Table 1 shows that when the valve of the tank car loaded with 20 tons of liquid chlorine has been completely damaged and liquid chlorine leaks continuously, the valve diameter of the tank is 25 mm, the leakage is 50%, and the wind speed is 5.4 meters/second; the lateral distances of the lethal circle, the semilethal circle, and the injury circle are 36 m, 99 m, and 144 m, respectively.
Table 1: Data table for lethal circle, semilethal circle, and injury circle.
In contrast, the [Ubx.sup.CPTI000601] insertion allele is semilethal as a homozygote with survivors exhibiting a weak haltere phenotype.
All known Ubx splicing variants are successfully trapped with the YFP exon in [Ubx.sup.CPTI000601], but this line is semilethal. An interesting question is why the line is semilethal.
Lethal t haplotypes may occur more frequently than semilethal t haplotypes (Klein et al.
Homozygotes for t haplotypes were present in four of the populations (Table 2), and the highest frequencies of t haplotypes we observed were in these populations where mice with complementing (and/or semilethal) t haplotypes were present (e.g., Mount View Rd., NJ, and Huntting Grain Elevator, IA).
However, the results provide no information on mutations becoming lethal or semilethal in harsh media.
195) argued that downward selection for longevity would probably result "in the collection of a series of more or less deleterious, semilethal or conditional lethal genes," which do not, however, have any bearing on the genes involved in aging.
Molecular techniques will also facilitate measuring the frequency of the other class of t haplotypes, the male-sterile (or semilethal) class.