semidominant


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semidominant

adjective Referring to the phenotypic effect of a particular allele on another allele with respect to a given trait. Allele A is said to be semidominant with respect to allele a if the A/A homozygote has a mutant phenotype and the A/a heterozygote has a less severe phenotype, while the a/a homozygote is wild-type.
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Each of these "target" individuals was placed in an 8 dram vial with 8 g of medium with seven adults of the same sex and eight adults of the opposite sex; the latter 15 adults were all homozygous for a semidominant black body color mutation segregating in the c-SM stock (cf.
(1989) combined two semidominant imidazolinone resistance genes from two canola lines, representing two unlinked genes, to produce an [F.sub.1] hybrid that was superior in imidazolinone resistance than either of the parents alone.
Until recently, seven major oat dwarfing mutants had been described officially and classified in Arena species (Marshall and Shaner, 1992); however, only two of them, the dominant Dw6 and the semidominant Dw7, are readily available, and only Dw6 is being used currently for cultivar development (Marshall et al., 1987; Anderson and McLean, 1989; D.D.
Dominant or semidominant dwarfing mutations have been identified at the Rht-B1 and Rht-D1 loci of wheat and the d8 locus of maize.
The semidominant nature of the Dw7 mutation would be in line with overexpression of a phytochrome gene.
Monogenic semidominant sulfonylurea resistance in a line of white chicory.