What is dominant, recessive, and codominant?

a gene that is expressed in an organism's phenotype, masking the effect of the recessive allele or gene when present. genetics of, or pertaining to An organism that expresses the dominant

it is a relationship between two alleles of a gene and their associated phenotypes; one allele can be dominant over a second allele, recessive to a third allele, and codominant to a fourth. Also, an allele may be dominant for a particular aspect of phenotype but not for other aspects influenced by the same gene.