Codominant: They are two factors or alleles both of which are able to express their effect when present together and are completely dominant even in heterozygous condition., e.g., IAIB.
Genotype: It is the genetic constitution or gene complement of an individual. Thus genotype for pure tall is TT, hybrid tall Tt and dwarf tt.
Phenotype: It is the external manifestation of a genotype and characteristics which are morphologically visible . Phenotype is not only dependent upon genotype but also upon the environment, nutrition, age and stage of development. Phenotype is usually similar to genotype in the homozygous state, e.g., pure tall (TT), dwarf (tt). The two are dissimilar in heterozygous state.
