Thus, although the detection of a dominant allele
may indicate a hidden carcinoma in some cases, the use of digital PCR does not overcome the limited analytical specificity of KRAS mutations for the diagnosis of pancreatic cancer.
Only the homozygous recessive genotype, yy, will produce genotypes that do not include a dominant allele
The first restorer system comprised of a single locus, A, with two alleles, in which male fertility is restored by the dominant allele
. The second restorer system is comprised of two loci, B and C, with complementary gene action.
The dominant allele
of a gene is symbolized by a capital letter, for example R, and the recessive by a lowercase letter--r.
Other alleles have a dominant effect, where a single copy of such an allele in the presence of a recessive allele is sufficient to create the same biological effects as two copies of the dominant allele
. A cross with complete dominance between a double heterozygote (SsTt) and a doubly homozygous recessive (sstt) produce four phenotypic classes representing four genotypes among the offsprings:
These results indicate that the bluish and greenish shell color variant types are controlled by a recessive allele (b) and a dominant allele
(G) at a single locus.
The difference in frequency between recessive and dominant alleles
is shown at the bottom row as the frequency unevenness (FU), calculated as the ratio of the frequencies of the most recessive allele to the most dominant allele
The white color and the mode of inheritance are controlled by an autosomal dominant allele
designated I (KIT) for 'inhibition of color' (Ollivier and Sellier, 1982).
Although the recessive allele (a) in the A locus can lead to black genotyped sheep, the dominant allele
([E.sup.d]) in E locus is epistatic over A alleles and produces black genotypes [22,23].
Peas with at least one dominant allele
, I, are yellow at maturity, whereas peas with two recessive genes, ii, are green at maturity.
Sverdlovsk sample 7.RA93.15.15 contained these dominant allele
signals, which suggests that these signals represent a single, specific strain of this pathogen.
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).