What type of genetic inheritance involves one allele being completely dominant over another?

The concept of complete dominance describes a scenario in genetic inheritance where one allele completely masks the effect of another allele at the same locus. In this case, the dominant allele's phenotype is expressed fully, while the recessive allele's phenotype has no impact on the organism's appearance or traits when the dominant allele is present.

In organisms displaying complete dominance, if an individual has at least one dominant allele, the traits associated with that allele will be expressed. This is in contrast to other forms of inheritance, such as incomplete dominance, where the traits blend together, and co-dominance, where both alleles express their traits simultaneously and independently. Polygenic inheritance involves multiple genes contributing to a single trait, often resulting in a continuous range of phenotypes. Each of these inheritance patterns varies significantly from complete dominance in terms of how alleles interact and affect phenotypic expression.