sieve" selects against deleterious
recessive alleles, allowing only
For a
recessive allele to be expressed, both alleles in the pair must be recessive.
A
recessive allele may be masked by a dominant allele, which leads to the expression "hidden recessive.
The notation AB/ab signifies that the dominant alleles (A,B) of two different gene loci are on one chromosome and the
recessive alleles (a,b) are on the homologous chromosome.
For those based on the inheritance of
recessive alleles, it is not the presence of two mutant alleles that causes the malady, but the absence of a normal allele.
Negative genes were higher in proportion similarly the
recessive alleles were higher than dominant alleles and scaling test showed that the additive dominant was partially adequate (Table 2).
The other E loci must be a
recessive allele (e), because that's all her sire had to give.
Recessive alleles, even when they are disadvantageous, can initially increase in a population as a result of drift, because they are "under the radar" of natural selection in heterozygotes and, while they are rare, it is unlikely that random mating among the dominant phenotype will result in recessive phenotypes in the offspring.
1 Given each parent's genetic makeup, assign an uppercase letter for a dominant allele (one that expresses a visible trait) and a lowercase letter for a
recessive allele (one that is masked by a dominant trait).
The segregation of the variant (bluish) type and the normal (greenish) type was 13:27, suggesting the existence of a
recessive allele at a single locus.
Note that the simulation of selection against a dominant or
recessive allele in the model can be accomplished by making the relative fitness of the heterozygote Rr equal to that of one of the homozygotes.
The Psp race-specific resistance to halo blight can be inherited quantitatively or by a single dominant or
recessive allele (Asensio et al.
